Mortini, Raymond, and Rudolf Rupp. “Approximation by Invertible Elements and the Generalized $E$-Stable Rank for $A({\boldsymbol D})_{\mathsf R}$ and $C({\boldsymbol D})_{\mathrm{sym}}$”. Mathematica Scandinavica 109, no. 1 (September 1, 2011): 114–132. Accessed July 24, 2026. https://journals.msp.org/mscand/article/view/517.