FURI, M.; PERA, M. P. Carathéodory periodic perturbations of the zero vector field on manifolds. Topological Methods in Nonlinear Analysis, [S. l.], v. 10, n. 1, p. 79–92, 1997. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1997.022. Acesso em: 22 jul. 2024.