@article{MAN_1977__230_163041,
     author = {F. Freitag},
     title = {Stabile {Modul} formen.},
     journal = {Mathematische Annalen},
     pages = {197--212},
     publisher = {mathdoc},
     volume = {230},
     year = {1977},
     url = {http://geodesic.mathdoc.fr/item/MAN_1977__230_163041/}
}