Dörsek, P., & Melenk, J. M. (2011). 𝘩𝘱-FEM for the Contact Problem with Tresca Friciton in Linear Elasticity: The Primal Formulation. In J. S. Hesthaven & E. M. Rønquist (Eds.), Spectral and High Order Methods for Partial Differential Equations : Selected papers from the ICOSAHOM ’09 conference, June 22-26, Trondheim, Norway (pp. 1–17). Springer Verlag. https://doi.org/10.1007/978-3-642-15337-2_1