@article{MOMA_1961__65_177116,
     author = {Ulrich Christian},
     title = {On {Certain} {Factors} of {Automorphy} for the {Modular} {Group} of {Degree} n.},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {82--87},
     publisher = {mathdoc},
     volume = {65},
     year = {1961},
     zbl = {0095.06403},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1961__65_177116/}
}