ŻOŁĄDEK, Henryk. Remarks on "The classification of reversible cubic systems with center". Topological Methods in Nonlinear Analysis, [S. l.], v. 8, n. 2, p. 335–342, 1996. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.037. Acesso em: 8 jul. 2025.