ARCHBOLD, Robert J.; KANIUTH, Eberhard. On the stable rank and real rank of group $C^*$-algebras of nilpotent locally compact groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 97, n. 1, p. 89–103, 2005. DOI: 10.7146/math.scand.a-14965. Disponível em: https://journals.msp.org/mscand/article/view/732. Acesso em: 25 jul. 2026.