@article{MZ_1939__45_168849,
     author = {H., Wielandt},
     title = {Eine {Verallgemeinerung} der invarianten {Untergruppen}},
     journal = {Mathematische Zeitschrift},
     pages = {209--244},
     publisher = {mathdoc},
     volume = {45},
     year = {1939},
     zbl = {0021.21003},
     url = {http://geodesic.mathdoc.fr/item/MZ_1939__45_168849/}
}