@article{MAN_1966__167_161488,
     author = {W. Roelcke},
     title = {Das {Eigenwertproblem} der automorphen formen in der hyperbolischen {Ebene,} {I}},
     journal = {Mathematische Annalen},
     pages = {292--337},
     publisher = {mathdoc},
     volume = {167},
     year = {1966},
     zbl = {0152.07705},
     url = {http://geodesic.mathdoc.fr/item/MAN_1966__167_161488/}
}