CERDA, Patricio; FARIA, Luiz F.O.; TOON, Eduard; UBILLA, Pedro. Two homoclinic orbits for some second-order Hamiltonian systems. Topological Methods in Nonlinear Analysis, [S. l.], v. 54, n. 2, p. 427–444, 2019. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2019.036. Acesso em: 3 jul. 2025.