BERTI, M.; BIASCO, L.; VALDINOCI, E. Periodic orbits close to elliptic tori and applications to the three-body problem. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 3, n. 1, p. 87-138, 2009. DOI: 10.2422/2036-2145.2004.1.06. Disponível em: http://20.103.181.36/index.php/annaliscienze/article/view/38. Acesso em: 27 may. 2025.