Graff, Grzegorz, Jerzy Jezierski, i Adrian Myszkowski. 2020. „Computations of the Least Number of Periodic Points of Smooth Boundary-Preserving Self-Maps of Simply-Connected Manifolds”. Topological Methods in Nonlinear Analysis 56 (2):589-606. https://apcz.umk.pl/TMNA/article/view/TMNA.2020.035.