@article{MZ_1943__49_169036,
     author = {H. Petersson},
     title = {Ein {Summationsverfahren} f\"ur die {Poincar\'eschen} {Reihen} von der {Dimension} ? 2 zu den hyperbolischen {Fixpunktpaaren}},
     journal = {Mathematische Zeitschrift},
     pages = {441--496},
     publisher = {mathdoc},
     volume = {49},
     year = {1943},
     zbl = {0028.35603},
     url = {http://geodesic.mathdoc.fr/item/MZ_1943__49_169036/}
}