FOX, R.; NEUWIRTH, L. The Braid Groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 10, p. 119–126, 1962. DOI: 10.7146/math.scand.a-10518. Disponível em: https://journals.msp.org/mscand/article/view/2675. Acesso em: 25 jul. 2026.