SABATINI, M. Dynamics of normalized systems on surfaces. Topological Methods in Nonlinear Analysis, [S. l.], v. 24, n. 1, p. 147–157, 2004. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2004.022. Acesso em: 20 jun. 2024.