FURI, Massimo; PERA, Maria Patrizia. 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: 8 jul. 2025.