@article{IM_1979__52_142641,
     author = {Hans Maa{\ss}},
     title = {\"Uber eine {Spezialschar} von {Modulformen} zweiten {Grades.}},
     journal = {Inventiones mathematicae},
     pages = {95--104},
     publisher = {mathdoc},
     volume = {52},
     year = {1979},
     zbl = {0386.10013},
     url = {http://geodesic.mathdoc.fr/item/IM_1979__52_142641/}
}