MAWHIN, J. Leray-Schauder degree: a half century of extensions and applications. Topological Methods in Nonlinear Analysis, [S. l.], v. 14, n. 2, p. 195–228, 1999. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1999.029. Acesso em: 22 jul. 2024.