PEDERSEN, Gert Kjaergard. 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://tidsskrift.dk/math/article/view/10948. Acesso em: 13 aug. 2026.