@article{MAN_1957__134_160591,
     author = {U. Christian},
     title = {Zur {Theorie} der {Modulfunktionen} n-ten {Grades} {II.}},
     journal = {Mathematische Annalen},
     pages = {298--307},
     publisher = {mathdoc},
     volume = {134},
     year = {1957},
     zbl = {0088.28901},
     url = {http://geodesic.mathdoc.fr/item/MAN_1957__134_160591/}
}