BARREIRA, L.; VALLS, C. Center Manifolds Optimal Regularity for Nonuniformly Hyperbolic Dynamics. São Paulo Journal of Mathematical Sciences, [S. l.], v. 5, n. 1, p. 1-22, 2011. DOI: 10.11606/issn.2316-9028.v5i1p1-22. Disponível em: https://www.revistas.usp.br/spjournal/article/view/65. Acesso em: 28 jan. 2023.