GLIKLIKH, Y. E. Total and local topological indices for maps of Hilbert and Banach manifolds. Topological Methods in Nonlinear Analysis, [S. l.], v. 15, n. 1, p. 17–31, 2000. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2000.002. Acesso em: 20 apr. 2024.