BROWN, Lawrence G.; PEDERSEN, Gert K. Ideal structure and $C^*$-algebras of low rank. MATHEMATICA SCANDINAVICA, [S. l.], v. 100, n. 1, p. 5–33, 2007. DOI: 10.7146/math.scand.a-15014. Disponível em: https://www.mscand.dk/article/view/15014. Acesso em: 5 dec. 2025.