@article{MZ_1929__30_168141,
     author = {F. L\"obell},
     title = {\"Uber die geod\"atischen {Linien} der {Clifford-Kleinschen} {Fl\"achen}},
     journal = {Mathematische Zeitschrift},
     pages = {572--607},
     year = {1929},
     volume = {30},
     zbl = {55.0959.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1929__30_168141/}
}