AMBROSETTI, A.; COTI ZELATI, V. Non-collision periodic solutions for a class of symmetric 3-body type problems. Topological Methods in Nonlinear Analysis, [S. l.], v. 3, n. 2, p. 197–207, 1994. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1994.010. Acesso em: 22 jul. 2024.