Idzik, Adam, and Konstanty Junosza-Szaniawski. “Combinatorial Lemmas for Nonoriented Pseudomanifolds”. Topological Methods in Nonlinear Analysis 22, no. 2 (December 1, 2003): 387–398. Accessed July 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2003.047.