@article{JRAM_1975__273_151544,
     author = {J\"urgen T\"olke},
     title = {Kinematik der hyperbolischen {Ebene.} {III.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {99--108},
     publisher = {mathdoc},
     volume = {273},
     year = {1975},
     zbl = {0304.53013},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1975__273_151544/}
}