@article{MZ_1977__156_172575,
     author = {Eberhard Freitag},
     title = {Die {Invarianz} gewisser von {Thetareihen} erzeugter {Vektorr\"aume} unter {Heckeoperatoren.}},
     journal = {Mathematische Zeitschrift},
     pages = {141--156},
     publisher = {mathdoc},
     volume = {156},
     year = {1977},
     zbl = {0359.10027},
     url = {http://geodesic.mathdoc.fr/item/MZ_1977__156_172575/}
}