@article{MZ_1983__182_173275,
     author = {I. Martin Isaacs},
     title = {Abelian {Normal} {Subgroups} of {M-Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {205--222},
     publisher = {mathdoc},
     volume = {182},
     year = {1983},
     zbl = {0512.20005},
     url = {http://geodesic.mathdoc.fr/item/MZ_1983__182_173275/}
}