BOOTH, P. I. Fibrations and Cofibred Pairs. Mathematica Scandinavica, Berkeley, CA, United States, v. 35, p. 145–148, 1974. DOI: 10.7146/math.scand.a-11541. Disponível em: https://journals.msp.org/mscand/article/view/2105. Acesso em: 25 jul. 2026.