%0 Journal Article %A Peral Menal %A Leonid N. Vaserstein %T On subgroups of GL2 over non-commutative local rings which are normalized by elementary matrices. %J Mathematische Annalen %D 1989 %P 221-232 %V 285 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1989__285_1_164596/ %F MAN_1989__285_1_164596