PEDERSEN, Gert Kjaergard. Measure Theory for $C^*$ Algebras IV. Mathematica Scandinavica, Berkeley, CA, United States, v. 25, p. 121–127, 1969. DOI: 10.7146/math.scand.a-10948. Disponível em: https://journals.msp.org/mscand/article/view/2395. Acesso em: 25 jul. 2026.