@article{MAN_1967__168_161504,
     author = {Walter Roelcke},
     title = {Das {Eigenwertproblem} der automorphen formen in der hyperbolischen {Ebene.} {II}},
     journal = {Mathematische Annalen},
     pages = {261--324},
     publisher = {mathdoc},
     volume = {168},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/MAN_1967__168_161504/}
}