JANCZEWSKA, J. Almost homoclinic solutions for the second order Hamiltonian systems. Topological Methods in Nonlinear Analysis, [S. l.], v. 32, n. 1, p. 131–137, 2008. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2008.040. Acesso em: 22 jul. 2024.