RESTORFF, Gunnar; RUIZ, Efren. On Rørdam’s classification of certain $C^*$-algebras with one non-trivial ideal, II. MATHEMATICA SCANDINAVICA, [S. l.], v. 101, n. 2, p. 280–292, 2007. DOI: 10.7146/math.scand.a-15045. Disponível em: https://tidsskrift.dk/math/article/view/15045. Acesso em: 14 aug. 2026.