@article{MOMA_1974__78_186316,
     author = {Karl Strambach},
     title = {Der {Kreisraum} einer sph\"arischen {M\"obiusebene.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {156--163},
     year = {1974},
     volume = {78},
     zbl = {0297.50023},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1974__78_186316/}
}