ĎURIKOVIČ, V.; ĎURIKOVIČOVÁ, M. Sets of solutions of nonlinear initial-boundary value problems. Topological Methods in Nonlinear Analysis, [S. l.], v. 17, n. 1, p. 157–182, 2001. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2001.011. Acesso em: 27 apr. 2024.