[1]
R. Mortini and R. Rupp, “Approximation by invertible elements and the generalized $E$-stable rank for $A({\boldsymbol D})_{\mathsf R}$ and $C({\boldsymbol D})_{\mathrm{sym}}$”, Math. Scand., vol. 109, no. 1, pp. 114–132, Sep. 2011.