PHILLIPS, N. Christopher. Simple $C^*$-algebras with the property weak (FU). Mathematica Scandinavica, Berkeley, CA, United States, v. 69, p. 127–151, 1991. DOI: 10.7146/math.scand.a-12372. Disponível em: https://journals.msp.org/mscand/article/view/1301. Acesso em: 24 jul. 2026.