@article{IM_1988__93_2_143613,
     author = {Ernst-Ulrich Gekeler},
     title = {On the coefficients of {Drinfeld} modular forms.},
     journal = {Inventiones mathematicae},
     pages = {667--700},
     publisher = {mathdoc},
     volume = {93},
     number = {2},
     year = {1988},
     zbl = {0653.14012},
     url = {http://geodesic.mathdoc.fr/item/IM_1988__93_2_143613/}
}