@article{MAN_1989__284_4_164551,
     author = {Walter M\"ohres},
     title = {Torsionsfreie {Gruppen,} deren {Untergruppen} alle subnormal sind.},
     journal = {Mathematische Annalen},
     pages = {245--250},
     publisher = {mathdoc},
     volume = {284},
     number = {4},
     year = {1989},
     zbl = {0648.20039},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__284_4_164551/}
}