Gierzkiewicz, Anna, and Klaudiusz Wójcik. “On the Cohomology of an Isolating Block and Its Invariant Part”. Topological Methods in Nonlinear Analysis 32, no. 2 (December 1, 2008): 313–326. Accessed December 13, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2008.050.