ALESSIO, Francesca; CALDIROLI, Paolo; MONTECCHIARI, Piero. On the existence of homoclinic orbits for the asymptotically periodic Duffing equation. Topological Methods in Nonlinear Analysis, [S. l.], v. 12, n. 2, p. 275–292, 1998. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.042. Acesso em: 8 jul. 2025.