PEDERSEN, G. K. Measure Theory for $C^*$ Algebras IV. MATHEMATICA SCANDINAVICA, [S. l.], v. 25, p. 121–127, 1969. DOI: 10.7146/math.scand.a-10948. Disponível em: https://www.mscand.dk/article/view/10948. Acesso em: 5 may. 2024.