@article{MAN_1937__113_159875,
     author = {B. Schoeneberg},
     title = {Indefinite {Quaternionen} und {Modulfunktionen}},
     journal = {Mathematische Annalen},
     pages = {CCCLXXX--CCCXCI},
     publisher = {mathdoc},
     volume = {113},
     year = {1937},
     zbl = {0015.06101},
     url = {http://geodesic.mathdoc.fr/item/MAN_1937__113_159875/}
}