@article{MZ_1986__192_173736,
     author = {Roelof W. Bruggeman},
     title = {Modular {Forms} of {Varying} {Weight.} {II.}},
     journal = {Mathematische Zeitschrift},
     pages = {297--328},
     publisher = {mathdoc},
     volume = {192},
     year = {1986},
     zbl = {0569.10011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__192_173736/}
}