@article{MAN_1963__152_161108,
     author = {U. Christian},
     title = {Zur {Theorie} der {Hilbert-Siegelschen} {Modulfunktionen.}},
     journal = {Mathematische Annalen},
     pages = {275--341},
     year = {1963},
     volume = {152},
     zbl = {0143.30403},
     url = {http://geodesic.mathdoc.fr/item/MAN_1963__152_161108/}
}