%0 Journal Article %A S. Montgomery %T A generalized Picard group for prime rings %J Banach Center Publications %D 1990 %P 55-63 %V 26 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/-26-1-55-63/ %R 10.4064/-26-1-55-63 %G en %F 10_4064__26_1_55_63