@article{JRAM_1982__331_152426,
     author = {Eberhard Freitag and Klaus Pommerening},
     title = {Regul\"are {Differentialformen} des {K\"orpers} der {Siegelschen} {Modulfunktionen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {207--220},
     publisher = {mathdoc},
     volume = {331},
     year = {1982},
     zbl = {0506.10025},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1982__331_152426/}
}