MARINO, A.; SACCON, C. Asymptotically critical points and multiple elastic bounce trajectories. Topological Methods in Nonlinear Analysis, [S. l.], v. 30, n. 2, p. 351–395, 2007. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2007.034. Acesso em: 3 jul. 2024.