@article{MAN_1961__144_160902,
     author = {U. Christian},
     title = {\"Uber die {Multiplikatorensysteme} gewisser {Kongruenzgruppen} ganzer {Hilbert-Siegelscher} {Modulsubstitutionen.}},
     journal = {Mathematische Annalen},
     pages = {422--460},
     publisher = {mathdoc},
     volume = {144},
     year = {1961},
     zbl = {0146.04202},
     url = {http://geodesic.mathdoc.fr/item/MAN_1961__144_160902/}
}