%0 Journal Article %A Everett C. Dade %T Normal Subgroups of M-Groups Need Not Be M-Groups. %J Mathematische Zeitschrift %D 1973 %P 313-318 %V 133 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1973__133_171961/ %F MZ_1973__133_171961