@article{MAN_1952__125_160308,
     author = {H. MAASS},
     title = {Die {Differentialgleichungen} in der {Theorie} der elliptischen {Modulfunktionen.}},
     journal = {Mathematische Annalen},
     pages = {235--263},
     publisher = {mathdoc},
     volume = {125},
     year = {1952},
     zbl = {0053.05601},
     url = {http://geodesic.mathdoc.fr/item/MAN_1952__125_160308/}
}