@article{MOMA_1956__60_177002,
     author = {Wilfried N\"obauer},
     title = {...-Untergruppen von {Restklassengruppen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {269--287},
     year = {1956},
     volume = {60},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1956__60_177002/}
}