Archbold, Robert J., and Eberhard Kaniuth. “On the Real Rank of $C^\ast$-Algebras of Nilpotent Locally Compact Groups”. MATHEMATICA SCANDINAVICA 110, no. 1 (March 1, 2012): 99–110. Accessed August 14, 2026. https://tidsskrift.dk/math/article/view/15199.