@article{MAN_1976__220_162826,
     author = {Erik A. Lippa},
     title = {Hecke {Eigenforms} of {Degree} {Two:} {Dirichlet} {Series} and {Euler} {Products.}},
     journal = {Mathematische Annalen},
     pages = {263--272},
     publisher = {mathdoc},
     volume = {220},
     year = {1976},
     zbl = {0327.10027},
     url = {http://geodesic.mathdoc.fr/item/MAN_1976__220_162826/}
}