@article{MZ_1985__190_173642,
     author = {Roelof W. Bruggeman},
     title = {Modular {Forms} of {Varying} {Weight.} {I.}},
     journal = {Mathematische Zeitschrift},
     pages = {477--496},
     publisher = {mathdoc},
     volume = {190},
     year = {1985},
     zbl = {0553.10021},
     url = {http://geodesic.mathdoc.fr/item/MZ_1985__190_173642/}
}