@article{MAN_1919__80_158810,
     author = {B. von Ker\'ekj\'ar\'o},
     title = {\"Uber die periodischen {Transformationen} der {Kreisscheibe} und der {Kugelfl\"ache.} {Von} {B.} von {Ker\'ekj\'art\'o} in {Ujpest} {(Ungarn).}},
     journal = {Mathematische Annalen},
     pages = {36--38},
     publisher = {mathdoc},
     volume = {80},
     year = {1919},
     zbl = {47.0526.05},
     url = {http://geodesic.mathdoc.fr/item/MAN_1919__80_158810/}
}