Alhazov, A., Freund, R., & Ivanov, S. (2024). On the spectrum between reaction systems and string rewriting. Natural Computing, 23, 159–175. https://doi.org/10.1007/s11047-024-09986-1 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., Orellana-Martín, D., Ramírez-de-Arellano, A., & Rodríguez  Gallego, J. A. (2024). P systems with reactive membranes. Journal of Membrane Computing, 6, 82–93. https://doi.org/10.1007/s41965-024-00144-1 ( reposiTUm)

Alhazov, A., Ferrari-Dominguez, V., Freund, R., Glade, N., & Ivanov, S. (2023). A P systems variant for reasoning about sequential controllability of Boolean networks. Theoretical Computer Science, 970, Article 114056. https://doi.org/10.1016/j.tcs.2023.114056 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., & Verlan, S. (2023). Numerical networks of cells. Theoretical Computer Science, 958, Article 113873. https://doi.org/10.1016/j.tcs.2023.113873 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., & Oswald, M. (2022). Variants of derivation modes for which purely catalytic {P} systemsare computationally complete. Theoretical Computer Science, 920, 95–112. https://doi.org/10.1016/j.tcs.2022.03.007 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., & Sergey Verlan. (2022). Regulated Insertion-Deletion Systems. Journal of Automata, Languages and Combinatorics, 27(1–3), 15–45. https://doi.org/10.25596/jalc-2022-015 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., & Verlan, S. (2022). Tissue P Systems with Vesicles of Multisets. International Journal of Foundations of Computer Science, 33(03n04), 179–202. https://doi.org/10.1142/S0129054122410015 ( reposiTUm)

Freund, R. (2021). Preface. Natural Computing, 20(4), 637–638. https://doi.org/10.1007/s11047-021-09872-0 ( reposiTUm)

Freund, R., Ivanov, S., & Alhazov, A. (2021). When catalytic P systems with one catalyst can be computationally complete. Journal of Membrane Computing, 3(3), 170–181. https://doi.org/10.1007/s41965-021-00079-x ( reposiTUm)

Freund, R., Ivanov, S., & Alhazov, A. (2021). P systems with limited number of objects. Journal of Membrane Computing, 3(1), 1–9. https://doi.org/10.1007/s41965-020-00068-6 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., & Oswald, M. (2021). Relations between Control Mechanisms for Sequential Grammars. Fundamenta Informaticae, 181(2–3), 239–271. https://doi.org/10.3233/fi-2021-2058 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., & Verlan, S. (2021). Variants of derivation modes for which catalytic P systems with one catalyst are computationally complete. Journal of Membrane Computing, 3(4), 233–245. https://doi.org/10.1007/s41965-021-00085-z ( reposiTUm)

Alhazov, A., Freund, R., & Ivanov, S. (2020). P systems with randomized right-hand sides of rules. Theoretical Computer Science, 805, 144–160. https://doi.org/10.1016/j.tcs.2018.07.016 ( reposiTUm)

Freund, R., & Alhazov, A. (2020). Time-freeness and clock-freeness and related concepts in {P} systems. Theoretical Computer Science, 805, 127–143. https://doi.org/10.1016/j.tcs.2018.09.009 ( reposiTUm)

Freund, R. (2020). How derivation modes and halting conditions may influence the computational power of P systems. Journal of Membrane Computing, 2(1), 14–25. https://doi.org/10.1007/s41965-019-00028-9 ( reposiTUm)

Alhazov, A., Freund, R., & Ivanov, S. (2019). Variants of P systems with activation and blocking of rules. Natural Computing. https://doi.org/10.1007/s11047-019-09747-5 ( reposiTUm)

Freund, R., Rogojin, V., & Verlan, S. (2019). Variants of Networks of Evolutionary Processors with Polarizations and a Small Number of Processors. International Journal of Foundations of Computer Science, 30(06n07), 1005–1027. https://doi.org/10.1142/s0129054119400264 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., Oswald, M., & Verlan, S. (2018). Extended spiking neural P systems with white hole rules and their red–green variants. Natural Computing, 17(2), 297–310. https://doi.org/10.1007/s11047-017-9649-7 ( reposiTUm)

Alhazov, A., Ivanov, S., Freund, R., Ivanov, S., Siromoney, R., & Subramanian, K. G. (2017). Contextual array grammars with matrix control, regular control languages, and tissue P systems control. Theoretical Computer Science, 682, 5–21. https://doi.org/10.1016/j.tcs.2017.03.012 ( reposiTUm)

Freund, R., & Fernau, H. (2017). Non-Isometric Contextual Array Grammars and the Role of Regular Control and Local Selectors. Fundamenta Informaticae, 155(1–2), 209–232. http://hdl.handle.net/20.500.12708/147176 ( reposiTUm)

Freund, R. (2017). Watson-Crick {T0L} Systems and Red-Green Register Machines. Fundamenta Informaticae, 155(1–2), 111–129. http://hdl.handle.net/20.500.12708/147175 ( reposiTUm)

Freund, R. (2016). Preface. Fundamenta Informaticae, 148(3–4). http://hdl.handle.net/20.500.12708/149938 ( reposiTUm)

Freund, R., Staiger, L., & Ivanov, S. (2016). Going Beyond Turing with {P} Automata: Regular Observer {\(\omega\)}-Languages and Partial Adult Halting. International Journal of Unconventional Computing, 12(1), 51–69. http://hdl.handle.net/20.500.12708/148979 ( reposiTUm)

Freund, R. (2016). Polymorphic P Systems. Bulletin of the International Membrane Computing Society, 12(2), 79–101. http://hdl.handle.net/20.500.12708/158093 ( reposiTUm)

Alhazov, A., Freund, R., Rogozhin, V., & Rogozhin, Y. (2016). Computational completeness of complete, star-like, and linear hybrid networks of evolutionary processors with a small number of processors. Natural Computing, 15(1), 51–68. https://doi.org/10.1007/s11047-015-9534-1 ( reposiTUm)

Fernau, H., Freund, R., Schmid, M. L., Subramanian, K. G., & Wiederhold, P. (2015). Contextual array grammars and array {P} systems. Annals of Mathematics and Artificial Intelligence, 75(1–2), 5–26. https://doi.org/10.1007/s10472-013-9388-0 ( reposiTUm)

Freund, R., Oswald, M., & Paun, G. (2015). Catalytic and Purely Catalytic {P} Systems and {P} Automata: Control Mechanisms for Obtaining Computational Completeness. Fundamenta Informaticae, 136(1–2), 59–84. http://hdl.handle.net/20.500.12708/151740 ( reposiTUm)

Freund, R., & Alhazov, A. (2015). Variants of Small Universal {P} Systems with Catalysts. Fundamenta Informaticae, 138(1–2), 227–250. http://hdl.handle.net/20.500.12708/151741 ( reposiTUm)

Fernau, H., Freund, R., & Holzer, M. (2015). The Finite Index Restriction Meets Hybrid Modes in Cooperating Distributed Grammar Systems. International Journal of Foundations of Computer Science, 26(08), 1167–1188. https://doi.org/10.1142/s0129054115400171 ( reposiTUm)

Freund, R., & Hava, T. (2014). Report on UCNC 2014. Bulletin of the EATCS, 114. http://hdl.handle.net/20.500.12708/157234 ( reposiTUm)

Freund, R., & Alhazov, A. (2014). Length P Systems. Fundamenta Informaticae, 134(1–2), 17–37. http://hdl.handle.net/20.500.12708/157270 ( reposiTUm)

Freund, R., & Alhazov, A. (2014). Antimatter as a Frontier of Tractability in Membrane Computing. Fundamenta Informaticae, 134(1–2), 83–96. http://hdl.handle.net/20.500.12708/157271 ( reposiTUm)

Freund, R., Pérez-Hurtado, I., Riscos Núñez, A., & Verlan, S. (2013). A formalization of membrane szstems with dynamically evolving structures. International Journal of Computer Mathematics, 90(4), 801–815. https://doi.org/10.1080/00207160.2012.748899 ( reposiTUm)

Alhazov, A., Freund, R., & Morita, K. (2012). Sequential and maximally parallel multiset rewriting: reversibility and determinism. Natural Computing, 11(1), 95–106. https://doi.org/10.1007/s11047-011-9267-8 ( reposiTUm)

Freund, R., Gheorghe, M., Marcus, S., Mitrana, V., & Pérez-Jiménez, M. (2011). Special Issue Natural Computing: Theory and Applications - Preface. International Journal of Foundations of Computer Science, 22(01), 1–6. https://doi.org/10.1142/s0129054111007770 ( reposiTUm)

Freund, R., & Gheorghe, M. (2011). Preface. International Journal of Foundations of Computer Science, 22(1), 1–6. http://hdl.handle.net/20.500.12708/163359 ( reposiTUm)

Freund, R., & Verlan, S. (2011). (Tissue) P systems working in the k - restricted minimally or maximally parallel transition mode. Natural Computing, 10(2), 821–833. https://doi.org/10.1007/s11047-010-9215-z ( reposiTUm)

Freund, R., & Oswald, M. (2008). CD Grammar Systems with Regular Start Conditions. International Journal of Foundations of Computer Science, 19(4), 767–779. http://hdl.handle.net/20.500.12708/170716 ( reposiTUm)

Freund, R., Oswald, M., & Ionescu, M. (2008). Extended Spiking Neural P Systems with Decaying Spikes and/or Total Spiking. International Journal of Foundations of Computer Science, 19(5), 1223–1234. http://hdl.handle.net/20.500.12708/170707 ( reposiTUm)

Freund, R., & Oswald, M. (2008). Regular ω-Languages defined by Extended Spiking Neural P Systems. Fundamenta Informaticae, 83(1–2), 65–73. http://hdl.handle.net/20.500.12708/170200 ( reposiTUm)

Cavaliere, M., Freund, R., Oswald, M., & Sburlan, D. (2007). Multiset random context grammars, checkers, and transducers. Theoretical Computer Science, 372, 136–151. http://hdl.handle.net/20.500.12708/169694 ( reposiTUm)

Freund, R., & Oswald, M. (2007). Partial Halting in P Systems. International Journal of Foundations of Computer Science, 18(6), 1215–1225. http://hdl.handle.net/20.500.12708/169693 ( reposiTUm)

Freund, R., & Tafill, F. (2007). Cellular Automata and Parallel Array Systems. Fundamenta Informaticae, 78(3), 311–327. http://hdl.handle.net/20.500.12708/169696 ( reposiTUm)

Freund, R., & Oswald, M. (2007). Modelling Grammar Systems by Tissue P Systems Working in the Sequential Mode. Fundamenta Informaticae, 76(3), 305–323. http://hdl.handle.net/20.500.12708/169689 ( reposiTUm)

Fernau, H., Freund, R., Oswald, M., & Reinhardt, K. (2007). Refining the Nonterminal Complexity of Graph-controlled, Programmed and Matrix Grammars. Journal of Automata, Languages and Combinatorics, 12(1/2), 117–138. http://hdl.handle.net/20.500.12708/170715 ( reposiTUm)

Freund, R., & Oswald, M. (2007). Tissue P Systems and (MEM) Brane Systems with Mate and Drip Operations Working on Strings. Electronic Notes in Theoretical Computer Science (ENTCS), 171, 105–115. http://hdl.handle.net/20.500.12708/169695 ( reposiTUm)

Alhazov, A., Freund, R., & Riscos-Núñez, A. (2006). Membrane division, restricted membrane creation and object complexity in P systems. International Journal of Computer Mathematics, 83(7), 529–548. http://hdl.handle.net/20.500.12708/173453 ( reposiTUm)

Alhazov, A., Freund, R., Leporati, A., Oswald, M., & Zandron, C. (2006). (Tissue) P Systems with Unit Rules and Energy Assigned to Membranes. Fundamenta Informaticae, 74(4), 391–408. http://hdl.handle.net/20.500.12708/173452 ( reposiTUm)

Alhazov, A., Freund, R., & Oswald, M. (2006). Cell/symbol complexity of tissue P systems with symport/antiport rules. International Journal of Foundations of Computer Science, 17(1), 3–25. http://hdl.handle.net/20.500.12708/173451 ( reposiTUm)

Freund, R., & Oswald, M. (2006). P colonies and prescribed teams. International Journal of Computer Mathematics, 83(7), 569–592. http://hdl.handle.net/20.500.12708/173454 ( reposiTUm)

Mateescu, A., & Freund, R. (2006). Routes and Products of Monoids. Fundamenta Informaticae, 73(1–2), 205–211. http://hdl.handle.net/20.500.12708/173450 ( reposiTUm)

Freund, R., Kari, L., Oswald, M., & Sosik, P. (2005). Computationally Universal P Systems without Priorities: Two Catalysts are Sufficient. Theoretical Computer Science, 330, 251–266. http://hdl.handle.net/20.500.12708/173321 ( reposiTUm)

Freund, R., Paun, G., & Pérez-Jiménez, M. (2005). Tissue P Systems with Channel States. Theoretical Computer Science, 330, 101–116. http://hdl.handle.net/20.500.12708/173350 ( reposiTUm)

Fernau, H., Freund, R., & Holzer, M. (2005). Representations of Recursively Enumerable Array Languages by Contextual Array Grammars. Fundamenta Informaticae, 64(1–4), 159–170. http://hdl.handle.net/20.500.12708/173351 ( reposiTUm)

Freund, R., & Paun, A. (2005). P systems with active membranes and without polarizations. Soft Computing, 9(9), 657–663. http://hdl.handle.net/20.500.12708/173352 ( reposiTUm)

Binder, A., Freund, R., & Oswald, M. (2005). Modelling Artificial Life by Attributed Eco-array Grammars. Artificial Life and Robotics, 9(1), 63–66. http://hdl.handle.net/20.500.12708/173349 ( reposiTUm)

Freund, R. (2005). P Systems Working in the Sequential Mode on Arrays and Strings. International Journal of Foundations of Computer Science, 16(4), 663–682. http://hdl.handle.net/20.500.12708/173348 ( reposiTUm)

Freund, R., Oswald, M., & Paun, A. (2005). Optimal Results for the Computational Completeness of Gemmating (Tissue) P Systems. International Journal of Foundations of Computer Science, 16(5), 929–942. http://hdl.handle.net/20.500.12708/173344 ( reposiTUm)

Freund, R., & Oswald, M. (2004). P Systems with Conditional Communication Rules Assigned to Membranes. Journal of Automata, Languages and Combinatorics, 9(4), 387–397. http://hdl.handle.net/20.500.12708/174840 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., & Verlan, S. (2022). Prescribed Teams of Rules Working on Several Objects. In Machines, Computations, and Universality (pp. 27–41). Springer. https://doi.org/10.1007/978-3-031-13502-6_6 ( reposiTUm)

Alhazov, A., Freund, R., & Ivanov, S. (2022). P versus B: P Systems as a Formal Framework for Controllability of Boolean Networks. In H. Bordihn, G. Horváth, & G. Vaszil (Eds.), Proceedings 12th International Workshop on Non-Classical Models of Automata and Applications, NCMA 2022 (pp. 28–48). https://doi.org/10.48550/arXiv.2208.14723 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., & Verlan, S. (2022). Prescribed Teams of Rules Working in Parallel on Different Objects. In Theorietag 2022 (pp. 21–24). http://hdl.handle.net/20.500.12708/136178 ( reposiTUm)

Freund, R. (2021). The Power of Parallelism in Membrane Computing. In Proceedings of the 21st Conference Information Technologies - Applications and Theory {(ITAT} (pp. 1–16). http://hdl.handle.net/20.500.12708/55634 ( reposiTUm)

Freund, R. (2019). A General Framework for Sequential Grammars with Control Mechanisms. In M. Hospodar (Ed.), Descriptional Complexity of Formal Systems (pp. 1–34). https://doi.org/10.1007/978-3-030-23247-4_1 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2019). P Systems with Anti-Membranes. In G. Paun (Ed.), Proceedings of the 20th Intern. Conf. on Membrane Computing CMC20 (pp. 249–256). http://hdl.handle.net/20.500.12708/57855 ( reposiTUm)

Freund, R., & Staiger, L. (2019). Turing machines with activations of transitions. In Eleventh Workshop on Non-Classical Models of Automata and Applications, NCMA (pp. 79–91). Österreichische Computer Gesellschaft. http://hdl.handle.net/20.500.12708/58029 ( reposiTUm)

Freund, R. (2019). Playing with Derivation Modes and Halting Conditions. In Proceedings of Seventeenth Brainstorming Week on Membrane Computing (pp. 91–108). Artes Gr a cas Moreno, S.L. http://hdl.handle.net/20.500.12708/58039 ( reposiTUm)

Freund, R. (2019). P Systems: from Anti-Matter to Anti-Rules. In Proceedings of Seventeenth Brainstorming Week on Membrane Computing (pp. 41–58). Artes Gr a cas Moreno, S.L. http://hdl.handle.net/20.500.12708/58038 ( reposiTUm)

Freund, R. (2019). (Tissue) P Systems with Anti-Membranes. In Proceedings of Seventeenth Brainstorming Week on Membrane Computing Sevilla, February 5-8, 2019 (pp. 29–40). Artes Gr a cas Moreno, S.L. http://hdl.handle.net/20.500.12708/58037 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2019). Beyond Generalized Multiplicities: Register Machines over Groups. In Seventeenth Brainstorming Week on Membrane Computing Sevilla, February 5 - 8, 2019 (pp. 1–28). Artes Gr a cas Moreno, S.L. http://hdl.handle.net/20.500.12708/57762 ( reposiTUm)

Freund, R. (2019). Playing with Derivation Modes. In G. Paun (Ed.), Proceedings of the 20th Intern. Conf. on Membrane Computing CMC20 (pp. 109–123). http://hdl.handle.net/20.500.12708/58051 ( reposiTUm)

Freund, R., Verlan, S., & Alhazov, A. (2019). A Formal Framework for Spiking Neural P Systems. In G. Paun (Ed.), Proceedings of the 20th Intern. Conf. on Membrane Computing CMC20 (pp. 523–536). Editura Bibliostar. http://hdl.handle.net/20.500.12708/58052 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2019). Register machines over groups. In Eleventh Workshop on Non-Classical Models of Automata and Applications, NCMA 2019 (pp. 31–46). Österreichische Computer Gesellschaft. http://hdl.handle.net/20.500.12708/58028 ( reposiTUm)

Freund, R., Alhazov, A., Ivanov, S., & Verlan, S. (2019). Tissue P Systems with Point Mutation Rules. In G. Rozenberg (Ed.), Membrane Computing. 19th International Conference, CMC 2018 (pp. 33–57). Springer International Publishing Switzerland. http://hdl.handle.net/20.500.12708/58027 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2018). Introducing the Concept of Activation and Blocking of Rules in the General Framework for Regulated Rewriting in Sequential Grammars. In G. Paun (Ed.), Sixteenth Brainstorming Week on Membrane Computing (pp. 1–22). Fénix Editora. http://hdl.handle.net/20.500.12708/57659 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2018). One-Membrane P Systems with Activation and Blocking of Rules. In G. Paun (Ed.), Sixteenth Brainstorming Week on Membrane Computing (pp. 23–38). Fénix Editora. http://hdl.handle.net/20.500.12708/57660 ( reposiTUm)

Freund, R., Oswald, M., & Alhazov, A. (2018). Input-Driven Tissue P Automata. In G. Paun (Ed.), Sixteenth Brainstorming Week on Membrane Computing (pp. 39–58). Fénix Editora. http://hdl.handle.net/20.500.12708/57661 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2018). Unfair P Systems. In K. Reinhardt (Ed.), Theorietage 2018, Wittenberg, Technical Report 18-1, Universität Halle-Wittenberg (pp. 87–90). Universität Halle-Wittenberg. http://hdl.handle.net/20.500.12708/57095 ( reposiTUm)

Freund, R., & Alhazov, A. (2018). Hierarchical P systems with randomized right-hand sides of rules. In M. Gheorghe (Ed.), Membrane Computing: 18th International Conference, CMC 2017, Bradford, UK, July 25-28, 2017, Revised Selected Papers (pp. 15–39). Springer International Publishing. http://hdl.handle.net/20.500.12708/57656 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2018). Unfair P Systems. In Proceedings of the Workshop on Membrane Computing at UCNC 2018. Fontainebleau, France June 25th, 2018 (pp. 63–71). TU Wien. http://hdl.handle.net/20.500.12708/57658 ( reposiTUm)

Freund, R. (2018). Sequential Grammars with Activation and Blocking of Rules. In S. Verlan (Ed.), Machines, Computations, and Universality (pp. 51–68). Springer. http://hdl.handle.net/20.500.12708/57416 ( reposiTUm)

Freund, R. (2018). P Systems with Activation and Blocking of Rules. In S. Verlan (Ed.), Unconventional Computation and Natural Computation (pp. 1–15). LNCS/Springer. http://hdl.handle.net/20.500.12708/57417 ( reposiTUm)

Freund, R. (2018). Tissue P Systems with Point Mutation Rules. In Proceedings of the 19th International Conference on Membrane Computing (pp. 29–50). Friedrich Schiller University Jena. http://hdl.handle.net/20.500.12708/57419 ( reposiTUm)

Freund, R. (2018). Control Mechanisms for Array Grammars on Cayley Grids. In S. Verlan (Ed.), Machines, Computations, and Universality (pp. 1–33). Springer. http://hdl.handle.net/20.500.12708/55493 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2017). Purely Catalytic P Systems over Integers and Their Generative Power. In G. Rozenberg (Ed.), International Conference on Membrane Computing 2016 (pp. 67–82). Springer LNCS. http://hdl.handle.net/20.500.12708/57080 ( reposiTUm)

Freund, R., Ivanov, S., & Alhazov, A. (2017). Simulating R Systems by P Systems. In International Conference on Membrane Computing 2016 (pp. 51–66). Springer LNCS. http://hdl.handle.net/20.500.12708/57079 ( reposiTUm)

Freund, R., Alhazov, A., & Verlan, S. (2017). P Systems Working in Maximal Variants of the Set Derivation Mode. In G. Rozenberg (Ed.), International Conference on Membrane Computing 2016 (pp. 83–102). Springer LNCS. http://hdl.handle.net/20.500.12708/57081 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2017). Transitional P Systems with Randomized Rule Right-hand Sides. In M. Gheorghe (Ed.), Preproceedings of the 18th Conference on Membrane Computing, CMC18, Bradford (pp. 23–47). IMCS. http://hdl.handle.net/20.500.12708/57083 ( reposiTUm)

Freund, R., & Alhazov, A. (2017). Time-freeness and Clock-freeness and Related Concepts in P Systems. In G. Paun (Ed.), Proceedings of BWMC 2017: 15th Brainstorming Week on Membrane Computing (2017), Sevilla (pp. 43–70). Fénix Editora. http://hdl.handle.net/20.500.12708/57184 ( reposiTUm)

Freund, R., Alhazov, A., & Verlan, S. (2017). Sequential Polarized Tissue P Systems with Vesicles of Multisets. In Conference on Mathematical Foundations of Informatics, 2017, Chişinău: Proceedings MFOI, 2017 (pp. 7–10). Acad. of Sciences of Moldova. http://hdl.handle.net/20.500.12708/57185 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2017). P Systems with Randomized Right-hand Sides of Rules. In G. Paun (Ed.), Proceedings of BWMC 2017: 15th Brainstorming Week on Membrane Computing (2017), Sevilla (pp. 13–42). Fénix Editora. http://hdl.handle.net/20.500.12708/57183 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2017). Unfair P Systems. In G. Paun (Ed.), Proceedings of BWMC 2017: 15th Brainstorming Week on Membrane Computing (2017), Sevilla (pp. 1–12). Fénix Editora. http://hdl.handle.net/20.500.12708/57182 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2017). P Systems and the Concept of Fairness. In Conference on Mathematical Foundations of Informatics, 2017, Chişinău: Proceedings MFOI, 2017 (pp. 11–26). Acad. of Sciences of Moldova. http://hdl.handle.net/20.500.12708/57101 ( reposiTUm)

Freund, R. (2017). P Systems with Random RHS Exchange. In Conference on Mathematical Foundations of Informatics, 2017, Chişinău: Proceedings MFOI, 2017 (pp. 27–30). Acad. of Sciences of Moldova. http://hdl.handle.net/20.500.12708/57102 ( reposiTUm)

Freund, R. (2017). Computational Completeness of Networks of Evolutionary Processors with Elementary Polarizations and a Small Number of Processors. In Descriptional Complexity of Formal Systems - 19th {IFIP} {WG} 1.02 International Conference, {DCFS} 2017, Milano, Italy, July 3-5, 2017, Proceedings} (pp. 140–151). Springer. http://hdl.handle.net/20.500.12708/56982 ( reposiTUm)

Freund, R. (2017). (Tissue) P Systems with Vesicles of Multisets. In Electronic Proceedings in Theoretical Computer Science (pp. 11–25). corr. https://doi.org/10.4204/eptcs.252.6 ( reposiTUm)

Freund, R. (2016). P Automata: New ideas and results. In Proceedings of Eighth Workshop on Non-Classical Models of Automata and Applications (pp. 13–40). Austrian Computer Society. http://hdl.handle.net/20.500.12708/56740 ( reposiTUm)

Freund, R., & Fernau, H. (2016). Contextual Array Grammars with Matrix and Regular Control. In Descriptional Complexity of Formal Systems (pp. 98–110). https://doi.org/10.1007/978-3-319-41114-9_8 ( reposiTUm)

Freund, R. (2016). P Systems Working in Set Modes. In Unconventional Computation and Natural Computation 15th International Conference, UCNC 2016, Manchester, UK, July 11-15, 2016, Proceedings (pp. 4–15). LNCS/Springer. http://hdl.handle.net/20.500.12708/56906 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2016). Extended Spiking Neural P Systems with States. In Unconventional Computation and Natural Computation (pp. 42–54). LNCS/Springer. http://hdl.handle.net/20.500.12708/56907 ( reposiTUm)

Freund, R. (2016). Purely Catalytic P Systems over Integers and Their Generative Power. In Proceccings of 17th International Conference on Membrane Computing (CMC17) (pp. 27–38). http://hdl.handle.net/20.500.12708/56908 ( reposiTUm)

Freund, R. (2016). Semilinear Sets, Register Machines, and Integer Vector Addition (P) Systems. In Proceedings of 17th International Conference on Membrane Computing (CMC17) (pp. 39–56). http://hdl.handle.net/20.500.12708/56909 ( reposiTUm)

Freund, R. (2016). Maximal Variants of the Set Derivation Mode. In Proceedings of 17th International Conference on Membrane Computing (CMC17) (pp. 57–72). http://hdl.handle.net/20.500.12708/56910 ( reposiTUm)

Freund, R. (2016). Simulating R Systems by P Systems. In Proceedings of 17th International Conference on Membrane Computing (CMC17) (pp. 13–26). http://hdl.handle.net/20.500.12708/56911 ( reposiTUm)

Freund, R. (2015). Non-isometric Contextual Array Grammars with Regular Control and Local Selectors. In J. Durand-Lose (Ed.), Machines, Computations, and Universality: 7th International Conference, MCU 2015, Famagusta, North Cyprus, September 9-11, 2015, Proceedings (pp. 61–78). Springer LNCS. http://hdl.handle.net/20.500.12708/56309 ( reposiTUm)

Freund, R. (2015). A Connection Between Red-Green Turing Machines and Watson-Crick T0L Systems. In J. Durand-Lose (Ed.), Machines, Computations, and Universality 7th International Conference, MCU 2015, Famagusta, North Cyprus, September 9-11, 2015, Proceedings (pp. 31–44). Springer International Publishing. https://doi.org/10.1007/978-3-319-23111-2_3 ( reposiTUm)

Freund, R. (2015). Variants of P Systems with Toxic Objects. In J. Sempere (Ed.), Proceedings of the 16th International Conference on Membrane Computing, {CMC} 2015 (pp. 23–49). http://hdl.handle.net/20.500.12708/56181 ( reposiTUm)

Freund, R. (2015). P Systems with Generalized Multisets Over Totally Ordered Abelian Groups. In J. Sempere (Ed.), Membrane Computing (pp. 117–136). https://doi.org/10.1007/978-3-319-28475-0_9 ( reposiTUm)

Freund, R., & Alhazov, A. (2015). Deterministic Non-cooperative P Systems with Strong Context Conditions. In G. Paun (Ed.), Proceedings of the Thirteenth Brainstorming Week on Membrane Computing (pp. 1–8). Fenix Editora. http://hdl.handle.net/20.500.12708/56138 ( reposiTUm)

Freund, R., & Alhazov, A. (2015). Polarizationless P Systems with One Active Membrane. In G. Paun (Ed.), Proceedings of the Thirteenth Brainstorming Week on Membrane Computing (pp. 9–18). Fenix Editora. http://hdl.handle.net/20.500.12708/56139 ( reposiTUm)

Freund, R., & Alhazov, A. (2015). Variants of P Systems with Toxic Objects. In G. Paun (Ed.), Proceedings of the Thirteenth Brainstorming Week on Membrane Computing (pp. 19–44). Fenix Editora. http://hdl.handle.net/20.500.12708/56140 ( reposiTUm)

Freund, R., Oswald, M., & Alhazov, A. (2015). Extended Spiking Neural P Systems with White Hole Rules. In G. Paun (Ed.), Proceedings of the Thirteenth Brainstorming Week on Membrane Computing (pp. 45–62). Fenix Editora. http://hdl.handle.net/20.500.12708/56141 ( reposiTUm)

Freund, R. (2015). On The Semantics of Annihilation Rules in Membrane Computing. In G. Paun (Ed.), Proceedings of the Thirteenth Brainstorming Week on Membrane Computing (pp. 131–142). Fenix Editora. http://hdl.handle.net/20.500.12708/56142 ( reposiTUm)

Freund, R., & Ivanov, S. (2015). How to Go Beyond Turing with P Automata: Time Travels, Regular Observer w-Languages, and Partial Adult Halting. In G. Paun (Ed.), Proceedings of the Thirteenth Brainstorming Week on Membrane Computing (pp. 143–158). Fenix Editora. http://hdl.handle.net/20.500.12708/56143 ( reposiTUm)

Freund, R. (2015). Solving SAT with Antimatter in Membrane Computing. In M. J. Dinneen (Ed.), CDMTCS Research Report Series Proceedings of the Workshop on Membrane Computing 2015 (WMC2015) (pp. 48–58). http://hdl.handle.net/20.500.12708/56372 ( reposiTUm)

Freund, R., & Staiger, L. (2015). Going Beyond Turing with P Automata: Partial Adult Halting and Regular Ovserver Languages. In C. S. Calude (Ed.), Unconventional Computation and Natural Computation (pp. 169–181). LNCS/Springer. http://hdl.handle.net/20.500.12708/56126 ( reposiTUm)

Freund, R., & Oswald, M. (2015). Going Beyond Turing with Extended Spiking Neural P Systems with White Hole Rules. In M. J. Dinneen (Ed.), Proceedings of the Workshop on Membrane Computing 2015 (WMC2015) (pp. 17–32). http://hdl.handle.net/20.500.12708/56371 ( reposiTUm)

Freund, R. (2015). Small Catalytic P Systems. In M. Dinneen (Ed.), Proceedings of the Workshop on Membrane Computing 2015 (WMC2015) (pp. 1–16). http://hdl.handle.net/20.500.12708/56370 ( reposiTUm)

Freund, R., Fernau, H., & Holzer, M. (2014). Cooperating Distributed Grammar Systems of Finite Index Working in Hybrid Modes. In Z. Esik (Ed.), Electronic Proceedings in Theoretical Computer Science (pp. 246–260). EPTCS. https://doi.org/10.4204/eptcs.151.17 ( reposiTUm)

Freund, R. (2014). Matter and Anti-Matter in Membrane Systems. In G. Paun (Ed.), 12th Brainstorming Week on membrane Computing - Proceedings (pp. 1–27). Fenix Editora. http://hdl.handle.net/20.500.12708/55333 ( reposiTUm)

Freund, R., & Alhazov, A. (2014). P Systems with Anti-Matter. In H. Bordihn (Ed.), 24.Theorietag “Automaten und Formale Sprachen” (pp. 19–23). Universität Potsdam. http://hdl.handle.net/20.500.12708/55332 ( reposiTUm)

Freund, R., & Alhazov, A. (2014). Priorities, Promoters and Inhibitors in Deterministic Non-cooperative P Systems. In M. Gheorghe (Ed.), Membrane Computing (pp. 86–98). https://doi.org/10.1007/978-3-319-14370-5_6 ( reposiTUm)

Freund, R., Verlan, S., & Alhazov, A. (2014). Promoters and Inhibitors in Purely Catalytic P Systems. In M. Gheorghe (Ed.), Membrane Computing (pp. 126–138). https://doi.org/10.1007/978-3-319-14370-5_8 ( reposiTUm)

Freund, R., & Alhazov, A. (2014). P Systems with Toxic Objects. In M. Gheorghe (Ed.), Membrane Computing (pp. 99–125). https://doi.org/10.1007/978-3-319-14370-5_7 ( reposiTUm)

Freund, R., & Alhazov, A. (2014). Priorities, Promoters and Inhibitors in Deterministic Non-Cooperative P Systems. In G. Paun (Ed.), 12th Brainstorming Week on membrane Computing - Proceedings (pp. 27–37). Fenix Editora. http://hdl.handle.net/20.500.12708/55334 ( reposiTUm)

Freund, R., & Alhazov, A. (2014). Length P Systems with a Lone Traveler. In G. Paun (Ed.), 12th Brainstorming Week on membrane Computing - Proceedings (pp. 37–49). Fenix Editora. http://hdl.handle.net/20.500.12708/55335 ( reposiTUm)

Freund, R., & Paun, G. (2014). P Systems with Anti-Matter. In G. Paun (Ed.), 12th Brainstorming Week on membrane Computing - Proceedings (pp. 169–183). Fenix Editora. http://hdl.handle.net/20.500.12708/55337 ( reposiTUm)

Freund, R., & Csuhaj-Varjú, E. (2014). Red-Green P Automata. In 12th Brainstorming Week on membrane Computing - Proceedings (pp. 73–79). Fenix Editora. http://hdl.handle.net/20.500.12708/55336 ( reposiTUm)

Freund, R. (2014). Red-Green P Automata. In M. Gheorghe (Ed.), Membrane Computing - 15th International Conference, CMC 2014 (pp. 139–157). http://hdl.handle.net/20.500.12708/55391 ( reposiTUm)

Freund, R., Paun, G., & Alhazov, A. (2014). P Systems with Matter and Anti-Matter. In A. Beckmann (Ed.), Tenth Conference on Computability in Europe, CiE 2014 Language, Life, Limits (p. 1). http://hdl.handle.net/20.500.12708/55728 ( reposiTUm)

Freund, R. (2014). Variants of P Automata. In New Computing Paradigms - Workshop (p. 7). http://hdl.handle.net/20.500.12708/55729 ( reposiTUm)

Freund, R., & Verlan, S. (2014). Flattening in (Tissue) P Systems. In A. Alhazov (Ed.), Membrane Computing (pp. 173–188). LNCS/Springer. https://doi.org/10.1007/978-3-642-54239-8_13 ( reposiTUm)

Freund, R., Alhazov, A., & Rogozhin, Y. (2014). Five Nodes Are Sufficient for Hybrid Networks of Evolutionary Processors to Be Computationally Complete. In O. H. Ibarra (Ed.), Unconventional Computation and Natural Computation (pp. 1–13). LNCS/Springer. https://doi.org/10.1007/978-3-319-08123-6_1 ( reposiTUm)

Freund, R., & Alhazov, A. (2014). P Systems with Anti-Matter. In M. Gheorghe & G. Rozenberg (Eds.), Membrane Computing (pp. 66–85). https://doi.org/10.1007/978-3-319-14370-5_5 ( reposiTUm)

Freund, R., & Paun, G. (2013). Universal P Systems: One Catalyst Can Be Sufficient. In G. Paun & L. Valencia-Cabrera (Eds.), Proceedings of Eleventh Brainstorming Week on Membrane Computing (pp. 81–97). Fenix Editora. http://hdl.handle.net/20.500.12708/54686 ( reposiTUm)

Freund, R. (2013). Two Catalysts Can Be Sufficent for Computational Completeness. In A. Alhazov (Ed.), The 14th International Conferense on Membrane Computing, CMC 14, Chisinau, Moldova (pp. 153–167). http://hdl.handle.net/20.500.12708/54977 ( reposiTUm)

Freund, R., Fernau, H., & Oswald, M. (2013). Undecidability and Computational Completeness for P Systems with One- and Two- dimensional Array Insertion and Deletion Rules. In A. Alhazov (Ed.), The 14th International Conferense on Membrane Computing, CMC 14, Chisinau, Moldova (pp. 309–313). http://hdl.handle.net/20.500.12708/54978 ( reposiTUm)

Freund, R., & Verlan, S. (2013). Computational Completeness withe Generationg and Accepting P Systems Using Minimal Left and Right Insertion and Deletion. In A. Alhazov (Ed.), The 14th International Conferense on Membrane Computing, CMC 14, Chisinau, Moldova (pp. 321–325). http://hdl.handle.net/20.500.12708/54980 ( reposiTUm)

Freund, R., Oswald, M., & Paun, G. (2013). Control Mechnisms for Obtaining Comutational Completeness. In Proceedings of The 14th International Conferense on Membrane Computing, CMC 14, Chisinau, Moldova (pp. 317–321). http://hdl.handle.net/20.500.12708/54979 ( reposiTUm)

Freund, R., & Paun, G. (2013). How to Obtain Computational Completeness in P Systems with One Catalyst. In T. Neary (Ed.), Electronic Proceedings in Theoretical Computer Science. https://doi.org/10.4204/eptcs.128 ( reposiTUm)

Freund, R., Oswald, M., & Alhazov, A. (2013). Sequential P Systems with Regular Control. In M. Gheorghe (Ed.), Membrane Computing (pp. 112–127). Springer LNCS. https://doi.org/10.1007/978-3-642-36751-9_9 ( reposiTUm)

Freund, R., & Alhazov, A. (2013). Asynchronous and maximally parallel deterministic controlled non-cooperative P systems characterize NFIN and coNFIN. In M. Gheorghe (Ed.), Membrane computing. 13th international conference, CMC 2012, Budapest, Hungary, August 28--31, 2012 (pp. 101–111). Springer LNCS. http://hdl.handle.net/20.500.12708/54982 ( reposiTUm)

Freund, R., & Oswald, M. (2013). Catalytic and purely catalytic P automata: control mechanisms for obtaining computational completeness. In S. Bensch & R. Freund (Eds.), Proceedings of the 5th Workshop on Non-Classical Models of Automata and Applications (NCMA) (pp. 133–150). http://hdl.handle.net/20.500.12708/54956 ( reposiTUm)

Freund, R., & Fernau, H. (2013). Array Insertion and Deletion P Systems. In G. Mauri & A. Dennunzio (Eds.), 12th International Conference, UCNC 2013, Milan, Italy, July 1-5, 2013. Proceedings (pp. 67–78). http://hdl.handle.net/20.500.12708/54955 ( reposiTUm)

Freund, R., & Fernau, H. (2013). Eine natürliche Membranhierachie. In Automaten und Formale Sprachen (pp. 49–52). http://hdl.handle.net/20.500.12708/54692 ( reposiTUm)

Freund, R., Fernau, H., & Oswald, M. (2013). Array insertion and deletion P systems. In Automaten und Formale Sprachen (pp. 46–49). http://hdl.handle.net/20.500.12708/54691 ( reposiTUm)

Freund, R. (2012). (Tissue) P Systems with Decaying Objects. In E. Csuhaj-Varjú (Ed.), Proceedings of 13th Int.Conference of Membrane Computing (pp. 1–26). http://hdl.handle.net/20.500.12708/54687 ( reposiTUm)

Freund, R., Oswald, M., & Verlan, S. (2012). Time-varying sequential P systems. In E. Csuhaj-Varjú (Ed.), 13th International Conference on Membrane Computing (pp. 99–114). MTA Sztaki. http://hdl.handle.net/20.500.12708/54218 ( reposiTUm)

Freund, R., & Verlan, S. (2012). A formal framework for P systems with Dynamic Structure. In E. Csuhaj-Varjú (Ed.), 13th International Conference on Membrane Computing (pp. 199–210). MTA Sztaki. http://hdl.handle.net/20.500.12708/54219 ( reposiTUm)

Freund, R., Rogozhin, Y., & Verlan, S. (2012). P Systems with Minimal Left and Right Insertion and Deletion. In J. Durand-Lose (Ed.), 11th Int. Conference on Unconventional Computation and Natural Computation (pp. 82–93). Springer LNCS. http://hdl.handle.net/20.500.12708/54221 ( reposiTUm)

Freund, R. (2012). Self-Stabilization in Membrane Systems. In G. Paun & A. Paun (Eds.), Tenth Brainstorming Week on Membrane Computing (pp. 1–10). Fénix Editora. http://hdl.handle.net/20.500.12708/54212 ( reposiTUm)

Freund, R., & Alhazov, A. (2012). Asynchronous and Maximally Parallel Deterministic Controlled Non-Cooperative P Systems Characterize NFIN. In E. Csuhaj-Varjú (Ed.), 13th International Conference on Membrane Computing (pp. 87–98). MTA Sztaki. http://hdl.handle.net/20.500.12708/54217 ( reposiTUm)

Freund, R., & Verlan, S. (2012). P Systems with Minimal Left and Right Insertion and Deletion. In M. Martinez (Ed.), Tenth Brainstorming Week on Membrane Computing (pp. 123–136). Fénix Editora. http://hdl.handle.net/20.500.12708/54215 ( reposiTUm)

Freund, R., & Alhazov, A. (2012). Asynchronous and Maximally Parallel Deterministic Controlled Non-Cooperative P Systems Characterize NFIN. In M. Martinez & G. Paun (Eds.), Tenth Brainstorming Week on Membrane Computing (pp. 25–34). Fénix Editora. http://hdl.handle.net/20.500.12708/54213 ( reposiTUm)

Freund, R., & Verlan, S. (2012). A formal framework for P systems with Dynamic Structure. In M. Martinez (Ed.), Tenth Brainstorming Week on Membrane Computing (pp. 111–122). Fénix Editora. http://hdl.handle.net/20.500.12708/54214 ( reposiTUm)

Freund, R. (2011). A General Framework for Regulated Rewriting. In J. Dassow & B. Truthe (Eds.), 21.Theorietag - Automaten und Formale Sprachen (pp. 37–41). Otto von Guericke Universität Magdeburg, Fakultät für Informatik. http://hdl.handle.net/20.500.12708/54099 ( reposiTUm)

Freund, R., Kogler, M., & Oswald, M. (2011). A General Framework for Regulated Rewriting Based on the Applicability of Rules. In J. Kelemen & A. Kelemenova (Eds.), Computation, Cooperation, and Life: Essays Dedicated to Gheorghe Paun on the Occasion of His 60th Birthday (pp. 35–53). Springer LNCS. https://doi.org/10.1007/978-3-642-20000-7_5 ( reposiTUm)

Freund, R., & Kogler, M. (2010). Computationally Complete Spiking Neural P Systems without Delay: Two Types of Neurons Are Enough. In M. Gheorghe & G. Paun (Eds.), 11th International Conference, CMC2010 - Membrane Computing (pp. 198–208). Springer LNCS. http://hdl.handle.net/20.500.12708/52559 ( reposiTUm)

Freund, R., & Kogler, M. (2010). Computationally Complete Spiking Neural P Systems without Delay: Two Types of Neurons Are Enough. In Proceedings of the Eleventh International Conference on Membrane Computing (pp. 193–205). Pro Business GmbH. http://hdl.handle.net/20.500.12708/53567 ( reposiTUm)

Freund, R., Kogler, M., & Verlan, S. (2009). P Automata with controlled use of minimal Communication rules. In H. Bordihn, R. Freund, & M. Holzer (Eds.), Workshop on Non-Classical Models for Automata and Applications (pp. 107–121). Österreichische Computer Ges. http://hdl.handle.net/20.500.12708/53045 ( reposiTUm)

Freund, R., & Verlan, S. (2008). (Tissue) P Systems Working in the k-Restricted Minimally Parallel Mode. In R. Freund, M. Oswald, E. Csuhaj-Varjú, & K. Salomaa (Eds.), International Workshop on Computing with Biomolecules (pp. 43–53). Oesterreichische Computer Gesellschaft. http://hdl.handle.net/20.500.12708/52400 ( reposiTUm)

Beyreder, M., & Freund, R. (2008). (Tissue) P systems using non-cooperative rules without halting conditions. In P. Frisco, D. W. Corne, & G. Paun (Eds.), Proceedings of the Ninth Workshop on Membrane Computing (pp. 85–94). http://hdl.handle.net/20.500.12708/52550 ( reposiTUm)

Freund, R., & Verlan, S. (2008). (Tissue) P Systems Working in the k-Restricted Minimally Parallel Mode. In M. Holzer, M. Kutrib, & A. Malcher (Eds.), 18.Theorietag - Automaten und Formale Sprachen (pp. 49–55). Justus-Liebig Verlag. http://hdl.handle.net/20.500.12708/52399 ( reposiTUm)

Binder, A., Freund, R., & Oswald, M. (2008). Extended Spiking neural P systems - variants for modeling the brain. In M. Sugisaka & H. Tanaka (Eds.), Proc.13th International Symposium on Artificial Life and Robotics AROB13th 2008 (pp. 520–524). http://hdl.handle.net/20.500.12708/52549 ( reposiTUm)

Freund, R., Ionescu, M., & Oswald, M. (2007). Extended spiking neural P systems with decaying spikes and/or total spiking. In G. Vaszil (Ed.), Proceedings of the International Workshop Automata for Cellular and Molecular Computing (pp. 64–75). MTA Sztaki. http://hdl.handle.net/20.500.12708/52042 ( reposiTUm)

Alhazov, A., Freund, R., Oswald, M., & Verlan, S. (2007). Partial Halting in P Systems Using Membrane Rules with Permitting Contexts. In J. Durand-Lose & M. Margenstern (Eds.), Machines, Computations, and Universality (pp. 110–121). LNCS, Springer. http://hdl.handle.net/20.500.12708/176630 ( reposiTUm)

Freund, R., & Oswald, M. (2007). Spiking neural P systems with inhibitory axons. In M. Sugisaka & H. Tamaka (Eds.), Proceedings of the 12th Interantional Symbosium on Artificial Life and Robotics (pp. 509–512). ISAROB 2007. http://hdl.handle.net/20.500.12708/52057 ( reposiTUm)

Freund, R., Paun, G., & Pérez-Jiménez, M. (2007). Polarizationless P Systems with Active Membranes Working in the Minimally Parallel Mode. In S. Akl & C. S. Calude (Eds.), Unconventional Computation (pp. 62–76). LNCS, Springer. http://hdl.handle.net/20.500.12708/52056 ( reposiTUm)

Freund, R., & Oswald, M. (2007). CD Grammar Systems with Regular Start Conditions. In V. Geffert & G. Pighizzini (Eds.), Descriptional Complexity of Formal Systems (pp. 69–80). http://hdl.handle.net/20.500.12708/52046 ( reposiTUm)

Freund, R., & Verlan, S. (2007). A formal framework for P systems. In G. Eleftherakis, P. Kefalas, & G. Paun (Eds.), Eighth Workshop on Membane Computing (WMC8) (pp. 317–330). South-East European Research Centre. http://hdl.handle.net/20.500.12708/52026 ( reposiTUm)

Freund, R., Ionescu, M., & Oswald, M. (2007). Extended spiking neural P systems with spikes of limited lifetime. In M. Droste & M. Lohrey (Eds.), 17.Theorietag Automaten und Formale Sprachen (pp. 45–49). http://hdl.handle.net/20.500.12708/52094 ( reposiTUm)

Binder, A., Freund, R., Oswald, M., & Vock, L. (2007). Modelling Logical Gates with ESNPA Systems. In M. Droste & M. Lohrey (Eds.), 17.Theorietag Automaten und Formale Sprachen (pp. 28–32). http://hdl.handle.net/20.500.12708/52092 ( reposiTUm)

Freund, R., & Oswald, M. (2007). Symport/Antiport Systems with Partial Halting. In M. Droste & M. Lohrey (Eds.), 17.Theorietag Automaten und Formale Sprachen (pp. 50–54). http://hdl.handle.net/20.500.12708/52095 ( reposiTUm)

Freund, R., Oswald, M., & Schirk, T. (2006). How a membrane agent buys goods in a membrane store. In L. Pan & G. Paun (Eds.), Pre-proc. of Int. Conf. on Bio-Inspired Computing - Theory and Applications, BIC-TA 2006, Membrane Computing Section (pp. 93–102). http://hdl.handle.net/20.500.12708/51721 ( reposiTUm)

Binder, A., Freund, R., Lojka, G., & Oswald, M. (2006). Applications of membrane systems in distributed systems. In L. Pan & G. Paun (Eds.), Pre-proc. of Int. Conf. on Bio-Inspired Computing - Theory and Applications, BIC-TA 2006, Membrane Computing Section (pp. 37–50). http://hdl.handle.net/20.500.12708/51722 ( reposiTUm)

Alhazov, A., Freund, R., & Oswald, M. (2006). Symbol/Membrane Complexity of P Systems with Symport/Antiport Rules. In R. Freund, G. Paun, G. Rozenberg, & A. Salomaa (Eds.), Membrane Computing · 6th International Workshop, WMC 2005, Vienna, Austria, July 18-21, 2005, Revised Selected and Invited Papers (pp. 97–114). Springer LNCS 3850. http://hdl.handle.net/20.500.12708/51724 ( reposiTUm)

Alhazov, A., Freund, R., & Rogozhin, Y. (2006). Computational Power of Symport/Antiport: History, Advances, and Open Problems. In R. Freund, G. Paun, G. Rozenberg, & A. Salomaa (Eds.), Membrane Computing · 6th International Workshop, WMC 2005, Vienna, Austria, July 18-21, 2005, Revised Selected and Invited Papers (pp. 1–31). Springer LNCS 3850. http://hdl.handle.net/20.500.12708/51723 ( reposiTUm)

Cavaliere, M., Freund, R., Oswald, M., & Sburlan, D. (2006). Multiset Random Context Grammars, Checkers, and Transducers. In M. A. Gutiérrez-Naranjo, G. Paun, A. Riscos-Núñez, & F. J. Romero-Campero (Eds.), Proceedings of the Fourth Brainstorming Week on Membrane Computing, Volume I (pp. 113–132). Fénix Editora. http://hdl.handle.net/20.500.12708/51726 ( reposiTUm)

Besozzi, D., Busi, N., Franco, G., Freund, R., & Paun, G. (2006). Two Universality Results for (Mem)Brane Systems. In M. A. Gutiérrez-Naranjo, G. Paun, A. Riscos-Núñez, & F. J. Romero-Campero (Eds.), Proceedings of the Fourth Brainstorming Week on Membrane Computing, Volume I (pp. 49–62). Fénix Editora. http://hdl.handle.net/20.500.12708/51725 ( reposiTUm)

Freund, R. (2006). Particular Results for Variants of P Systems with One Catalyst in One Membrane. In C. Graciani-Díaz, G. Paun, Á. Romero-Jiménez, & F. Sancho-Caparrini (Eds.), Proceedings of the Fourth Brainstorming Week on Membrane Computing, Volume II (pp. 41–50). Fénix Editora. http://hdl.handle.net/20.500.12708/51728 ( reposiTUm)

Freund, R., & Oswald, M. (2006). Small Universal Antiport P Systems and Universal Multiset Grammars. In C. Graciani-Díaz, G. Paun, Á. Romero-Jiménez, & F. Sancho-Caparrini (Eds.), Proceedings of the Fourth Brainstorming Week on Membrane Computing, Volume II (pp. 51–64). Fénix Editora. http://hdl.handle.net/20.500.12708/51729 ( reposiTUm)

Chen, H., Freund, R., Ionescu, M., Paun, G., & Pérez-Jiménez, M. (2006). On String Languages Generated by Spiking Neural P Systems. In M. A. Gutiérrez-Naranjo, G. Paun, A. Riscos-Núñez, & F. J. Romero-Campero (Eds.), Proceedings of the Fourth Brainstorming Week on Membrane Computing, Volume I (pp. 169–194). Fénix Editora. http://hdl.handle.net/20.500.12708/51727 ( reposiTUm)

Alhazov, A., Freund, R., Oswald, M., & Slavkovik, M. (2006). Extended Spiking Neural P Systems Generating Strings and Vectors of Non-Negative Integers. In H. J. Hoogeboom, G. Paun, & G. Rozenberg (Eds.), pre-proceedings of the 7th Workshop on Membrane Computing WMC7 (pp. 88–101). http://hdl.handle.net/20.500.12708/51730 ( reposiTUm)

Bernardini, F., & Freund, R. (2006). Tissue P Systems with Communication Modes. In H. J. Hoogeboom, G. Paun, & G. Rozenberg (Eds.), pre-proceedings of the 7th Workshop on Membrane Computing WMC7 (pp. 132–144). http://hdl.handle.net/20.500.12708/51731 ( reposiTUm)

Csuhaj-Varjú, E., Freund, R., & Sburlan, D. (2006). Modeling the Dynamical Parallelism of Bio-Systems. In H. J. Hoogeboom, G. Paun, & G. Rozenberg (Eds.), pre-proceedings of the 7th Workshop on Membrane Computing WMC7 (pp. 290–310). http://hdl.handle.net/20.500.12708/51732 ( reposiTUm)

Freund, R., & Oswald, M. (2006). Tissue P systems with mate and drip operations. In N. Busi & C. Zandron (Eds.), MeCBIC2006 Workshop on Membrane Computing and Biologically Inspired Process Calculi (pp. 1–12). http://hdl.handle.net/20.500.12708/51733 ( reposiTUm)

Freund, R., & Gschwandtner, T. (2006). P Systems for Modelling Biological Processes in Living Cells. In R. Freund & M. Oswald (Eds.), Proceedings 16.Theorietag Automaten und Formale Sprachen (pp. 46–50). http://hdl.handle.net/20.500.12708/51737 ( reposiTUm)

Binder, A., Freund, R., Lojka, G., & Oswald, M. (2006). Modelling Distributed Systems by P Systems. In R. Freund & M. Oswald (Eds.), Proceedings 16.Theorietag Automaten und Formale Sprachen (pp. 22–27). http://hdl.handle.net/20.500.12708/51736 ( reposiTUm)

Freund, R., Oswald, M., & Schirk, T. (2006). Membrane Systems with Attributes for Modelling Business Transactions. In R. Freund & M. Oswald (Eds.), Proceedings 16.Theorietag Automaten und Formale Sprachen (pp. 57–62). http://hdl.handle.net/20.500.12708/51735 ( reposiTUm)

Alhazov, A., Freund, R., Oswald, M., & Slavkovik, M. (2006). Extended Spiking Neural P Systems as Generating Devices for Strings and Vectors of Non-Negative Integers. In R. Freund & M. Oswald (Eds.), Proceedings 16.Theorietag Automaten und Formale Sprachen (pp. 17–21). http://hdl.handle.net/20.500.12708/51734 ( reposiTUm)

Freund, R., & Oswald, M. (2006). (Mem)Brane Systems and Tissue P Systems with Mate and Drip Operations. In R. Freund & M. Oswald (Eds.), Proceedings 16.Theorietag Automaten und Formale Sprachen (pp. 51–56). http://hdl.handle.net/20.500.12708/51738 ( reposiTUm)

Alhazov, A., Freund, R., & Rogozhin, Y. (2005). Some Optimal Results on Symport/Antiport P Systems with Minimal Cooperation. In M. A. Gutiérrez-Naranjo, G. Paun, & M. Pérez-Jiménez (Eds.), Cellular Computing (Complexity Aspects) (pp. 23–36). Fénix Editora. http://hdl.handle.net/20.500.12708/51152 ( reposiTUm)

Freund, R., Ibarra, O. H., Paun, G., & Yen, H.-C. (2005). Matrix Languages, Register Machines, Vector Addition Systems. In M. A. Gutiérrez-Naranjo, A. Riscos-Núñez, F. J. Romero-Campero, & D. Sburlan (Eds.), Third Brainstorming Week on Membrane Computing (pp. 155–168). Fénix Editora. http://hdl.handle.net/20.500.12708/51150 ( reposiTUm)

Cavaliere, M., Freund, R., Leitsch, A., & Paun, G. (2005). Event-related Outputs of Computations in P Systems. In M. A. Gutiérrez-Naranjo, A. Riscos-Núñez, F. J. Romero-Campero, & D. Sburlan (Eds.), Third Brainstorming Week on Membrane Computing (pp. 107–122). Fénix Editora. http://hdl.handle.net/20.500.12708/51149 ( reposiTUm)

Alhazov, A., Freund, R., & Oswald, M. (2005). Tissue P Systems with Antiport Rules and Small Numbers of Symbols and Cells. In M. A. Gutiérrez-Naranjo, G. Paun, & M. Pérez-Jiménez (Eds.), Cellular Computing (Complexity Aspects) (pp. 7–22). Fénix Editora. http://hdl.handle.net/20.500.12708/51151 ( reposiTUm)

Binder, A., Freund, R., Lojka, G., & Oswald, M. (2005). Membrane Systems as a Model for Distributed Computing. In H. Fernau (Ed.), 15. Theorietag der GI Fachgruppe 0.1.5 Automaten und Formale Sprachen (pp. 1–5). http://hdl.handle.net/20.500.12708/51146 ( reposiTUm)

Alhazov, A., & Freund, R. (2005). P Systems with One Membrane and Symport/Antiport Rules of Five Symbols are Coputationally Complete. In M. A. Gutiérrez-Naranjo, A. Riscos-Núñez, F. J. Romero-Campero, & D. Sburlan (Eds.), Third Brainstorming Week on Membrane Computing (pp. 19–28). Fénix Editora. http://hdl.handle.net/20.500.12708/51148 ( reposiTUm)

Fernau, H., Freund, R., Oswald, M., & Reinhardt, K. (2005). Optimal Nonterminal Complexity of Graph-controlled Grammars. In H. Fernau (Ed.), 15. Theorietag der GI Fachgruppe 0.1.5 Automaten und Formale Sprachen (pp. 13–17). http://hdl.handle.net/20.500.12708/51147 ( reposiTUm)

Freund, R., & Oswald, M. (2005). Tissue P Systems with Symport/Antiport Rules of One Symbol are Computationally Universal. In M. A. Gutiérrez-Naranjo, G. Paun, & M. Pérez-Jiménez (Eds.), Cellular Computing (Complexity Aspects) (pp. 187–200). Fénix Editora. http://hdl.handle.net/20.500.12708/51153 ( reposiTUm)

Alhazov, A., Freund, R., & Riscos-Núñez, A. (2005). One and Two Polarizations, Membrane Creation and Objects Complexity in P Systems. In G. Ciobanu & G. Paun (Eds.), Proceedings of the 1st International Workshop on Theory and Application of P Systems (pp. 9–18). ??? http://hdl.handle.net/20.500.12708/51157 ( reposiTUm)

Alhazov, A., Freund, R., & Paun, G. (2005). Computational Completeness of P Systems with Active Membranes and Two Polarizations. In M. Margenstern (Ed.), Machines, Computations, and Universality (pp. 82–92). Springer, LNCS. http://hdl.handle.net/20.500.12708/51160 ( reposiTUm)

Freund, R., & Oswald, M. (2005). P Colonies Working in the Maximally Parallel and in the Sequential Mode. In G. Ciobanu & G. Paun (Eds.), Proceedings of the 1st International Workshop on Theory and Application of P Systems (pp. 49–56). http://hdl.handle.net/20.500.12708/51158 ( reposiTUm)

Fernau, H., Freund, R., Oswald, M., & Reinhardt, K. (2005). Refining the Nonterminal Complexity of Graph-controlled Grammars. In C. Mereghetti, B. Palano, G. Pighizzini, & D. Wotschke (Eds.), Seventh International Workshop on Descriptional Complexity of Formal Systems, Proceedings (pp. 110–121). http://hdl.handle.net/20.500.12708/51159 ( reposiTUm)

Freund, R., Leporati, A., Oswald, M., & Zandron, C. (2005). Sequential P Systems with Unit Rules and Energy Assigned to Membranes. In M. Margenstern (Ed.), Machines, Computations, and Universality (pp. 200–210). Springer, LNCS. http://hdl.handle.net/20.500.12708/51161 ( reposiTUm)

Freund, R. (2005). Asynchronous P Systems and P Systems Working in the Sequential Mode. In G. Mauri, G. Paun, M. Pérez-Jiménez, G. Rozenberg, & A. Salomaa (Eds.), Membrane Computing. International Workshop, WMC 2004 (pp. 36–62). Springer, LNCS. http://hdl.handle.net/20.500.12708/51162 ( reposiTUm)

Alhazov, A., Freund, R., & Oswald, M. (2005). Tissue P Systems with Antiport Rules and Small Numbers of Symbols and Cells. In C. De Felice & A. Restivo (Eds.), Developments in Language Theory. 9th International Conference, DLT 2005 (pp. 100–111). Springer. http://hdl.handle.net/20.500.12708/51165 ( reposiTUm)

Alhazov, A., & Freund, R. (2005). On the Efficiency of P Systems with Active Membranes and Two Polarizations. In G. Mauri, G. Paun, M. Pérez-Jiménez, G. Rozenberg, & A. Salomaa (Eds.), Membrane Computing. International Workshop, WMC 2004 (pp. 146–160). Springer, LNCS. http://hdl.handle.net/20.500.12708/51163 ( reposiTUm)

Freund, R., Oswald, M., & Paun, A. (2005). P Systems Generating Trees. In G. Mauri, G. Paun, M. Pérez-Jiménez, G. Rozenberg, & A. Salomaa (Eds.), Membrane Computing. International Workshop, WMC 2004 (pp. 309–319). Springer, LNCS. http://hdl.handle.net/20.500.12708/51164 ( reposiTUm)

Alhazov, A., Freund, R., & Oswald, M. (2005). Symbol/Membrane Complexity of P Systems with Symport/Antiport Rules. In F. Freund, G. Lojka, M. Oswald, & G. Paun (Eds.), Preproceedings of the 6th International Workshop on Membrane Computing WMC6 (pp. 123–146). http://hdl.handle.net/20.500.12708/51167 ( reposiTUm)

Alhazov, A., Freund, R., & Rogozhin, Y. (2005). Computational Power of Symport/Antiport: History, Advances and Open Problems. In R. Freund, G. Lojka, M. Oswald, & G. Paun (Eds.), Preproceedings of the 6th International Workshop on Membrane Computing WMC6 (pp. 44–78). http://hdl.handle.net/20.500.12708/51166 ( reposiTUm)

Freund, R. (2004). P Systems Working in the Sequential Mode on Arrays and Strings. In C. S. Calude, E. Calude, & M. J. Dinneen (Eds.), Developments in Language Theory, 8th International Conference, DLT 2004, Auckland, New Zealand, December 13-17, Proceedings (pp. 188–199). Springer LNCS 3340. http://hdl.handle.net/20.500.12708/50970 ( reposiTUm)

Freund, R., Alhazov, A., & Verlan, S. (2018). Small Universal Reversible Counter Machines. In A. Adamatzky (Ed.), Emergence, Complexity and Computation (pp. 433–446). Springer International Publishing. http://hdl.handle.net/20.500.12708/29939 ( reposiTUm)

Freund, R., Oswald, M., & Alhazov, A. (2018). Chocolate P Automata. In G. Paun (Ed.), Enjoying Natural Computing (pp. 1–20). Springer International Publishing. https://doi.org/10.1007/978-3-030-00265-7_1 ( reposiTUm)

Freund, R., & Oswald, M. (2015). Algebraic Representation of Regular Array Languages on Cayley Graphs. In G. Paun (Ed.), Discrete Mathematics and Computer Science (pp. 165–189). Editura Academiei Romane. http://hdl.handle.net/20.500.12708/28930 ( reposiTUm)

Freund, R., Rogozhin, Y., & Verlan, S. (2014). Generating and accepting P systems with minimal left and right insertion and deletion. In J. M. Ferrandez (Ed.), Natural Computing (pp. 257–268). Springer. https://doi.org/10.1007/s11047-013-9396-3 ( reposiTUm)

Freund, R., & Alhazov, A. (2014). Small P Systems Defining Non-semilinear Sets. In A. Adamatzky (Ed.), Automata, Computation, Universality (pp. 183–217). Springer International Publishing. http://hdl.handle.net/20.500.12708/28547 ( reposiTUm)

Bachinger, A., Brandhofer, G., Fuchs, K., Futschek, G., Freund, R., Gabriel, S., Goebl, R., Grossmann, W., Micheuz, P., Neuwirth, E., Nosko, C., Schedler, M., Traxler, P., & Wohlhart, D. (2013). Vermittlung informatischer Kompetenzen und Medienkompetenzen in allen Lehramtstudien aller Ausbildungsinstitute Österreichs. In Digitale Schule Österreich (pp. 67–70). books@ocg.at. http://hdl.handle.net/20.500.12708/27978 ( reposiTUm)

Freund, R., & Taschner, R. (2011). Bildung 2.0. In Best Spirit: Best Practice (pp. 109–113). Braumüller. http://hdl.handle.net/20.500.12708/27529 ( reposiTUm)

Freund, R., & Paun, A. (2010). Catalytic P Systems. In G. Paun, G. Rozenberg, & A. Salomaa (Eds.), The Oxford Handbook of Membrane Computing (pp. 83–118). Oxford University Press. http://hdl.handle.net/20.500.12708/27084 ( reposiTUm)

Freund, R., Paun, G., & Rozenberg, G. (2006). Contextual Array Grammars. In K. G. Subramanian (Ed.), Formal Models, Languages and Applications (pp. 112–136). World Scientific. http://hdl.handle.net/20.500.12708/25402 ( reposiTUm)

Nagy, B., & Freund, R. (Eds.). (2023). Proceedings of the 13th International Workshop on Non-Classical Models of Automata and Applications (Vol. 388). https://doi.org/10.4204/EPTCS.388 ( reposiTUm)

Freund, R., Tseren-Onolt, I., Rozenberg, G., Salomaa, A., & ZANDRON, C. (Eds.). (2021). Membrane Computing. Springer International Publishing. https://doi.org/10.1007/978-3-030-77102-7 ( reposiTUm)

Freund, R., & Holzer, M. (Eds.). (2019). Eleventh Workshop on Non-Classical Models of Automata and Applications, NCMA 2019, Valencia, Spain, July 2-3, 2019. OCG (Österreichische Computer Gesellschaft). http://hdl.handle.net/20.500.12708/24632 ( reposiTUm)

Freund, R., & Ivanov, S. (Eds.). (2018). Proceedings of the Workshop on Membrane Computing at UCNC 2018. TU Wien. http://hdl.handle.net/20.500.12708/24536 ( reposiTUm)

Freund, R. (Ed.). (2018). Proceedings of the Tenth Workshop on Non-Classical Models of Automata and Applications, (NCMA). OCG (Österreichische Computer Gesellschaft). http://hdl.handle.net/20.500.12708/24454 ( reposiTUm)

Freund, R. (Ed.). (2017). Ninth Workshop on Non-Classical Models of Automata and Applications, {NCMA} 2017, Prague, Czech Republic. Österreichische Computer Gesellschaft. http://hdl.handle.net/20.500.12708/176089 ( reposiTUm)

Freund, R., & Bordihn, H. (Eds.). (2016). Eighth Workshop on Non-Classical Models of Automata and Applications (NCMA 2016). OCG (Österreichische Computer Gesellschaft). http://hdl.handle.net/20.500.12708/176086 ( reposiTUm)

Freund, R. (Ed.). (2015). Seventh Workshop on Non-Classical Models of Automata and Applications. OCG (Österreichische Computer Gesellschaft). http://hdl.handle.net/20.500.12708/176081 ( reposiTUm)

Bordihn, H., & Freund, R. (Eds.). (2010). Second Workshop on Non-Classical Models for Automata and Applications (NCMA 2010). Österreichische Computer Gesellschaft. http://hdl.handle.net/20.500.12708/23260 ( reposiTUm)

Unconventional Computing. (2008). In C. S. Calude, J. F. Costa, R. Freund, M. Oswald, & G. Rozenberg (Eds.), Lecture Notes in Computer Science. Springer LNCS. https://doi.org/10.1007/978-3-540-85194-3 ( reposiTUm)

Freund, R., Paun, G., Rozenberg, G., & Salomaa, A. (Eds.). (2006). Membrane Computing · 6th International Workshop, WMC 2005, Vienna, Austria, July 18-21, 2005, Revised Selected and Invited Papers. Springer LNCS 3850. http://hdl.handle.net/20.500.12708/22337 ( reposiTUm)

Alhazov, A., Freund, R., Ivanov, S., & Verlan, S. (2024, June 3). Simple P Systems and Variants of Derivation Modes [Keynote Presentation]. CMC 2024, Nizza, France. http://hdl.handle.net/20.500.12708/202724 ( reposiTUm)

Freund, R. (2019). Reversibility and Determinism in P Systems. Reversibility in Programming, Languages, and Automata (RPLA), Porto, Portugal. http://hdl.handle.net/20.500.12708/86966 ( reposiTUm)

Freund, R. (2019). Tissue P Systems with Anti-Cells. 29. Theorietag Automaten und Formale Sprachen, Bremen, Germany. http://hdl.handle.net/20.500.12708/86971 ( reposiTUm)

Freund, R., & Alhazov, A. (2019). Blind and partially blind reister machines over groups. NCMA 2019, Valencia, Spain. http://hdl.handle.net/20.500.12708/86965 ( reposiTUm)

Freund, R., Alhazov, A., & Ivanov, S. (2018). Activation and Blocking of Rules. The 5th Annual Rogozhin Lectures on Foundations of Informatics and Unconventional Computing Systems, Chisinau, Moldova (the Republic of). http://hdl.handle.net/20.500.12708/86822 ( reposiTUm)

Freund, R. (2016). Models of Grammars Inspired by Marcus Contextual Grammars. DCFS 2016, Bukarest, Romania. http://hdl.handle.net/20.500.12708/86478 ( reposiTUm)

Freund, R. (2016). Computations on a Moebius Rope. 17th International Conference on Membrane Computing (CMC17), Mailand, Italy. http://hdl.handle.net/20.500.12708/86477 ( reposiTUm)

Freund, R. (2016). Variants of Energy-Controlled P Systems. NIT 2016, Valencia, Spain. http://hdl.handle.net/20.500.12708/86325 ( reposiTUm)

Freund, R. (2016). Red-Green P Automata. 26.Theorietag Automata und Formale Sprachen, Tannenfelde, Germany. http://hdl.handle.net/20.500.12708/86319 ( reposiTUm)

Freund, R. (2016). Variants of Energy-Controlled P Systems" Autoren. Workshop “Unconventional Computing Systems” in commemoration of Yuri Rogozhin, Chisinau, Moldova (the Republic of). http://hdl.handle.net/20.500.12708/86473 ( reposiTUm)

Freund, R., & Alhazov, A. (2015). New Results for Small Universal P Systems Based on the Simulation of Generalized Register Machines and Generalized Counter Automata. CMC’16 Membrane Computing, Valencia, Spain. http://hdl.handle.net/20.500.12708/86217 ( reposiTUm)

Freund, R., & Verlan, S. (2015). The Set-Maximally Parallel Derivation Mode. CMC’16 Membrane Computing, Valencia, Spain. http://hdl.handle.net/20.500.12708/86216 ( reposiTUm)

Freund, R. (2015). Computational Completeness and Universality in Membrane Computing. CMC’16 Membrane Computing, Valencia, Spain. http://hdl.handle.net/20.500.12708/86218 ( reposiTUm)

Freund, R., & Ivanov, S. (2015). P Systems with Multiple Catalysts of the Same Name. CMC’16 Membrane Computing, Valencia, Spain. http://hdl.handle.net/20.500.12708/86215 ( reposiTUm)

Freund, R. (2015). Going Beyond Turing with Watson-Crick T0L Systems. UCNC 2015, Auckland, New Zealand. http://hdl.handle.net/20.500.12708/86219 ( reposiTUm)

Freund, R., & Freund, M. (2012). Rechnen mit Molekülen. Institutskolloquium des Instituts für Informatik, Halle an der Saale, EU. http://hdl.handle.net/20.500.12708/85377 ( reposiTUm)

Freund, R., & Alhazov, A. (2012). Membrane Systems With Membrane Labels Changing in Time. 10th Brainstoming Week on Membrane Computing, Sevilla, EU. http://hdl.handle.net/20.500.12708/85308 ( reposiTUm)

Freund, R., Kudlek, M., & Flick, N. E. (2012). Language Operators for Multiset languages and Modal Logic. NCMA, Breslau, Poland. http://hdl.handle.net/20.500.12708/85374 ( reposiTUm)

Freund, R., Kogler, M., & Oswald, M. (2011). A General Framework for Regulated Rewriting Based on the Applicability of Rules. Workshop on Computation, Cooperation, and Life, Otava, Teschechien, EU. http://hdl.handle.net/20.500.12708/85306 ( reposiTUm)

Freund, R. (2008). P Systems Working in the 1-restricted Minimally Parallel Derivation Mode. Workshop on Language-Theoretic Models of Decentralized and Distributed Systems, Opava, EU. http://hdl.handle.net/20.500.12708/84737 ( reposiTUm)

Freund, R. (2008). An Integrating View on DNA Computing and Membrane Computing. 10th WSEAS Int. Conf. on MATHEMATICAL METHODS AND COMPUTATIONAL TECHNIQUES IN ELECTRICAL ENGINEERING (MMACTEE ’08), Sofia, Bulgaria, EU. http://hdl.handle.net/20.500.12708/84835 ( reposiTUm)

Freund, R. (2008). Bio-Inspired Computing: DNA Computing and Membrane Computing. BIRD’08 2nd International Conference on Bioinformatics Research and Development, Wien, Austria. http://hdl.handle.net/20.500.12708/84837 ( reposiTUm)

Freund, R. (2008). Membrane Systems. The 12th World Multi-Conference on Systemics, Cybernetics and Informatics: WMSCI 2008, Orlando, Florida, Non-EU. http://hdl.handle.net/20.500.12708/84836 ( reposiTUm)

Freund, R. (2006). Algebraic representation of regular array languages. ESF Exploratory Workshop: Advances on Two-dimensional Language Theory, Salerno, Italien, EU. http://hdl.handle.net/20.500.12708/84571 ( reposiTUm)

Freund, R. (2006). Syntactical pattern recognition with 2-dimensional array grammars and array automata. ESF Exploratory Workshop: Advances on Two-dimensional Language Theory, Salerno, Italien, EU. http://hdl.handle.net/20.500.12708/84570 ( reposiTUm)

Freund, R. (2006). Special variants of P systems with one catalyst in one membrane. DCFS (Descriptional Complexity of Formal Systems), Las Cruces, New Mexico, USA, Non-EU. http://hdl.handle.net/20.500.12708/84574 ( reposiTUm)

Freund, R., & Oswald, M. (2006). (Tissue) P Systems with Mate and Drip Operations and Cut and Paste Operations. ESF Workshop on Automata and formal languages for DNA computation and bioinformatics, Como, Italien, EU. http://hdl.handle.net/20.500.12708/84573 ( reposiTUm)

Freund, R., & Oswald, M. (2006). A small universal antiport P system with forbidden context. DCFS (Descriptional Complexity of Formal Systems), Las Cruces, New Mexico, USA, Non-EU. http://hdl.handle.net/20.500.12708/84575 ( reposiTUm)

Freund, R. (2005). Membrane Computing. 4th WSEAS International Conference on ARTIFICIAL INTELLIGENCE, KNOWLEDGE ENGINEERING and DATABASES (AIKED `05), Salzburg, Austria. http://hdl.handle.net/20.500.12708/84457 ( reposiTUm)

Freund, R., & Oswald, M. (2004). Tissue P Systems Simulating Grammar Systems. Molecular Computing, Leiden, the Netherlands, Austria. http://hdl.handle.net/20.500.12708/84276 ( reposiTUm)

Freund, R. (2004). P Systems Working in the Asynchronous and the Sequential Mode. Molecular Computing, Leiden, the Netherlands, Austria. http://hdl.handle.net/20.500.12708/84277 ( reposiTUm)

Freund, R., & Oswald, M. (2004). P Systems with Antiport Rules for Evolution Rules. WSEAS Internation Conference on Evolutionary Computation, Udine, Italy, Austria. http://hdl.handle.net/20.500.12708/84299 ( reposiTUm)

Alhazov, A., Freund, R., & Paun, G. (2004). Computational Completeness of P Systems with Active Membranes and Two Polarizations. MCU (International Conference Machines, Computations and Universality), Orleans, France. http://hdl.handle.net/20.500.12708/84274 ( reposiTUm)

Freund, R., Leporati, A., Oswald, M., & Zandron, C. (2004). Sequential P Systems with Unit Rules and Energy Assigned to Membranes. MCU (International Conference Machines, Computations and Universality), Orleans, France. http://hdl.handle.net/20.500.12708/84275 ( reposiTUm)

Freund, R. (2004). Asynchronous P Systems on Arrays and Strings. International Conference on  Developments in Language Theory (DLT), Palermo, Italy. http://hdl.handle.net/20.500.12708/84278 ( reposiTUm)

Freund, R., & Oswald, M. (2003). P Systems with Elementary Graph Productions. EMCC Spring Meeting, Turku, Finland, Austria. http://hdl.handle.net/20.500.12708/84255 ( reposiTUm)

Freund, R., & Oswald, M. (2003). Complexity of P Automata with Catalysts. Annual Meeting of Project MolCoNet, Budapest, Hungary. http://hdl.handle.net/20.500.12708/84256 ( reposiTUm)

Freund, R. (2002). P automata on finite and infinite words. Annual Meeting of Project MolCoNet, Budapest, Austria. http://hdl.handle.net/20.500.12708/84111 ( reposiTUm)

Freund, R. (2002). P systems versus register machines: two universality proofs. Workshop on Membrane Computing, Wien, Austria. http://hdl.handle.net/20.500.12708/84109 ( reposiTUm)

Freund, R. (2002). Some comments on P systems with communication. Workshop on Membrane Computing, Wien, Austria. http://hdl.handle.net/20.500.12708/84110 ( reposiTUm)