ĎURIKOVIČ, V.; ĎURIKOVIČOVÁ, M. Topological structure of solution sets to parabolic problems. Topological Methods in Nonlinear Analysis, [S. l.], v. 25, n. 2, p. 313–349, 2005. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2005.016. Acesso em: 16 jan. 2022.