@article{MZ_1973__133_171957,
     author = {Helmut Wielandt},
     title = {Vertauschbarkeit von {Untergruppen} und {Subnormalit\"at.}},
     journal = {Mathematische Zeitschrift},
     pages = {275--276},
     year = {1973},
     volume = {133},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__133_171957/}
}