PEDERSEN, Gert Kjaergard. A Decomposition Theorem for $C^*$ Algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 22, p. 266–268, 1968. DOI: 10.7146/math.scand.a-10890. Disponível em: https://journals.msp.org/mscand/article/view/2409. Acesso em: 25 jul. 2026.