PEJSACHOWICZ, J. Bifurcation of Fredholm maps I. The index bundle and bifurcation. Topological Methods in Nonlinear Analysis, [S. l.], v. 38, n. 1, p. 115–168, 2011. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2011.026. Acesso em: 22 jul. 2024.