@article{JRAM_1980__320_152296,
     author = {Rolf-Dieter Kulle},
     title = {Zum {Basisproblem} in der {Theorie} der {Modulformen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {99--114},
     publisher = {mathdoc},
     volume = {320},
     year = {1980},
     zbl = {0432.10011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1980__320_152296/}
}