Borsari, Lucilía D., and Daciberg L. Gonçalves. “Obstruction Theory and Minimal Number of Coincidences for Maps from a Complex into a Manifold”. Topological Methods in Nonlinear Analysis 21, no. 1 (March 1, 2003): 115–130. Accessed April 24, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2003.007.