@article{IM_1979__53_142664,
     author = {Hans Maa{\ss}},
     title = {\"Uber eine {Spezialschar} von {Modulformen} zweiten {Grades} {(II).}},
     journal = {Inventiones mathematicae},
     pages = {249--254},
     publisher = {mathdoc},
     volume = {53},
     year = {1979},
     zbl = {0413.10021},
     url = {http://geodesic.mathdoc.fr/item/IM_1979__53_142664/}
}