RESTORFF, Gunnar; RUIZ, Efren. On Rørdam’s classification of certain $C^*$-algebras with one non-trivial ideal, II. Mathematica Scandinavica, Berkeley, CA, United States, v. 101, n. 2, p. 280–292, 2007. DOI: 10.7146/math.scand.a-15045. Disponível em: https://journals.msp.org/mscand/article/view/652. Acesso em: 24 jul. 2026.