@article{MOMA_1982__94_178091,
     author = {Ragnar Rudolph},
     title = {Ein {Untergruppensatz} f\"ur modulare {Gruppen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {149--154},
     publisher = {mathdoc},
     volume = {94},
     year = {1982},
     zbl = {0483.20015},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1982__94_178091/}
}