MORTINI, Raymond; RUPP, Rudolf. Approximation by invertible elements and the generalized $E$-stable rank for $A({\boldsymbol D})_{\mathsf R}$ and $C({\boldsymbol D})_{\mathrm{sym}}$. Mathematica Scandinavica, Berkeley, CA, United States, v. 109, n. 1, p. 114–132, 2011. DOI: 10.7146/math.scand.a-15180. Disponível em: https://journals.msp.org/mscand/article/view/517. Acesso em: 24 jul. 2026.