Virtual Knot Groups and Combinatorial Knots. São Paulo Journal of Mathematical Sciences, [S. l.], v. 3, n. 2, p. 299–316, 2009. DOI: 10.11606/issn.2316-9028.v3i2p299-316. Disponível em: https://www.revistas.usp.br/spjournal/article/view/49.. Acesso em: 27 abr. 2024.