@article{MOMA_1973__77_177652,
     author = {Peter Gerl},
     title = {Diskrete, mittelbare {Gruppen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {307--318},
     publisher = {mathdoc},
     volume = {77},
     year = {1973},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1973__77_177652/}
}