@article{MAN_1957__133_160551,
     author = {U. Christian},
     title = {Zur {Theorie} der {Modulfunktionen} n-ten {Grades.}},
     journal = {Mathematische Annalen},
     pages = {281--297},
     publisher = {mathdoc},
     volume = {133},
     year = {1957},
     zbl = {0088.28803},
     url = {http://geodesic.mathdoc.fr/item/MAN_1957__133_160551/}
}