An almost existence theorem for non-contractible periodic orbits in cotangent bundles. São Paulo Journal of Mathematical Sciences, [S. l.], v. 6, n. 2, p. 385–394, 2012. DOI: 10.11606/issn.2316-9028.v6i2p385-394. Disponível em: https://www.revistas.usp.br/spjournal/article/view/74500.. Acesso em: 2 maio. 2024.