@article{MAN_1968__177_161716,
     author = {A. PRESTEL},
     title = {Die elliptischen {Fixpunkte} der {Hilbertschen} {Modulgruppen.}},
     journal = {Mathematische Annalen},
     pages = {181--209},
     publisher = {mathdoc},
     volume = {177},
     year = {1968},
     zbl = {0159.11302},
     url = {http://geodesic.mathdoc.fr/item/MAN_1968__177_161716/}
}