OLIVEIRA, R. D. S.; TEIXEIRA, M. A. On pairs of polynomial planar foliations. Topological Methods in Nonlinear Analysis, [S. l.], v. 30, n. 1, p. 139–155, 2007. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2007.022. Acesso em: 24 apr. 2024.