GEDEON, Tomáš; MISCHAIKOW, Konstantin. Singular boundary value problems via the Conley index. Topological Methods in Nonlinear Analysis, [S. l.], v. 28, n. 2, p. 263–283, 2006. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2006.030. Acesso em: 8 jul. 2025.