Guritanu, V., Wissgott, P., Weig, T., Winkler, H., Sichelschmidt, J., Scheffler, M., Prokofiev, A., Kimura, S., Iizuka, T., Strydom, A. M., Dressel, M., Steglich, F., Held, K., & Paschen, S. (2013). Anisotropic optical conductivity of the putative Kondo insulator CeRu₄Sn₆. Physical Review B, 87(115129). https://doi.org/10.1103/physrevb.87.115129