Chang, Kung Ching, i N. Ghoussoub. „The Conley Index and the Critical Groups via an Extension of Gromoll-Meyer Theory”. Topological Methods in Nonlinear Analysis 7, no. 1 (marzec 1, 1996): 77–93. Udostępniono lipiec 22, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.1996.003.