Generalized euclidean group rings. K. Dennis; B. Magurn; L. Vaserstein — 1984 Journal für die reine und angewandte Mathematik
Work of Pere Menal on normal subgroups. Frank A. Arlinghaus; Leonid L. Vaserstein — 1992 Publicacions Matemàtiques We describe subgroups of GLA which are normalized by elementary matrices for rings A satisfying the first stable range condition, Banach algebras A, von Neumann regular rings A, and other rings A.
On normal subgroups of GL 2 over rings with many units L. N. Vaserstein — 1990 Compositio Mathematica