@article{MAN_1967__168_161500,
     author = {Helmut Klingen},
     title = {\"Uber {Poincar\'esche} {Reihen} zur {Siegleschen} {Modulgruppe}},
     journal = {Mathematische Annalen},
     pages = {157--170},
     publisher = {mathdoc},
     volume = {168},
     year = {1967},
     zbl = {0145.09802},
     url = {http://geodesic.mathdoc.fr/item/MAN_1967__168_161500/}
}