@article{MAN_1964__154_161153,
     author = {R. FRITZSCHE},
     title = {Beitrag zur {Theorie} der {Modulfunktionen} 2. {Grades.}},
     journal = {Mathematische Annalen},
     pages = {135--146},
     publisher = {mathdoc},
     volume = {154},
     year = {1964},
     zbl = {0125.04203},
     url = {http://geodesic.mathdoc.fr/item/MAN_1964__154_161153/}
}