@article{ELMA_1964__19_140790,
     author = {H. Zeitler},
     title = {Eine regul\"are {Horozyklen\"uberdeckung} der hyperbolischen {Ebene} im {Poincar\'e-Modell.}},
     journal = {Elemente der Mathematik},
     pages = {73--77},
     publisher = {mathdoc},
     volume = {19},
     year = {1964},
     zbl = {0122.41203},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1964__19_140790/}
}