%0 Journal Article %A Morton E. Harris %T Filtrations, Stable Clifford Theory and Group-Graded Rings and Modules. %J Mathematische Zeitschrift %D 1987 %P 497-510 %V 196 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1987__196_173898/ %F MZ_1987__196_173898