Lines of Curvature on Surfaces, Historical Comments and Recent Developments. São Paulo Journal of Mathematical Sciences, [S. l.], v. 2, n. 1, p. 99–143, 2008. DOI: 10.11606/issn.2316-9028.v2i1p99-143. Disponível em: https://www.revistas.usp.br/spjournal/article/view/24.. Acesso em: 28 abr. 2024.