%0 Journal Article %A Kenneth R. Goodearl %T Global Dimension of Differential Operator Rings. IV - Simple Modules. %J Forum mathematicum %D 1989 %P 185-200 %V 1 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/FORUM_1989__1_3_141611/ %F FORUM_1989__1_3_141611