SRZEDNICKI, R. On solutions of two-point boundary value problems inside isolating segments. Topological Methods in Nonlinear Analysis, [S. l.], v. 13, n. 1, p. 73–89, 1999. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1999.004. Acesso em: 18 apr. 2024.