@article{MZ_1973__133_171961,
     author = {Everett C. Dade},
     title = {Normal {Subgroups} of {M-Groups} {Need} {Not} {Be} {M-Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {313--318},
     publisher = {mathdoc},
     volume = {133},
     year = {1973},
     zbl = {0255.20007},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__133_171961/}
}