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@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/} }
Roelof W. Bruggeman. Modular forms of varying weights.. Journal für die reine und angewandte Mathematik, Tome 371 (1986), pp. 144-190. http://geodesic.mathdoc.fr/item/JRAM_1986__371_152873/