KEHLET, Esben T. A proof of the Mackey-Blattner-Nielsen theorem. Mathematica Scandinavica, Berkeley, CA, United States, v. 43, p. 329–335, 1978. DOI: 10.7146/math.scand.a-11786. Disponível em: https://journals.msp.org/mscand/article/view/1857. Acesso em: 25 jul. 2026.