RABINOWITZ, P. H. Homoclinics for an almost periodically forced singular Hamiltonian system. Topological Methods in Nonlinear Analysis, [S. l.], v. 6, n. 1, p. 49–66, 1995. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.031. Acesso em: 3 jul. 2024.