@article{JRAM_1986__371_152873,
     author = {Roelof W. Bruggeman},
     title = {Modular forms of varying weights.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {144--190},
     publisher = {mathdoc},
     volume = {371},
     year = {1986},
     zbl = {0588.10021},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1986__371_152873/}
}