GOLDBERG, Charles H. An Exact Sequence of Braid Groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 33, p. 69–82, 1973. DOI: 10.7146/math.scand.a-11472. Disponível em: https://journals.msp.org/mscand/article/view/2197. Acesso em: 25 jul. 2026.