ARCHBOLD, Robert J.; KANIUTH, Eberhard. On the stable rank and real rank of group $C^*$-algebras of nilpotent locally compact groups. MATHEMATICA SCANDINAVICA, [S. l.], v. 97, n. 1, p. 89–103, 2005. DOI: 10.7146/math.scand.a-14965. Disponível em: https://tidsskrift.dk/math/article/view/14965. Acesso em: 14 aug. 2026.