COTI ZELATI, Vittorio; RABINOWITZ, Paul H. Multibump periodic solutions of a family of Hamiltonian systems. Topological Methods in Nonlinear Analysis, [S. l.], v. 4, n. 1, p. 31–57, 1994. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1994.022. Acesso em: 8 jul. 2025.