GOLDBERG, C. H. An Exact Sequence of Braid Groups. MATHEMATICA SCANDINAVICA, [S. l.], v. 33, p. 69–82, 1973. DOI: 10.7146/math.scand.a-11472. Disponível em: https://www.mscand.dk/article/view/11472. Acesso em: 3 may. 2024.