FOX, R.; NEUWIRTH, L. The Braid Groups. MATHEMATICA SCANDINAVICA, [S. l.], v. 10, p. 119–126, 1962. DOI: 10.7146/math.scand.a-10518. Disponível em: https://www.mscand.dk/article/view/10518. Acesso em: 24 nov. 2024.