@article{ELMA_1971__26_141029,
     author = {Hubert Frank},
     title = {Zur ebenen hyperbolischen {Kinematik.}},
     journal = {Elemente der Mathematik},
     pages = {121--131},
     publisher = {mathdoc},
     volume = {26},
     year = {1971},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1971__26_141029/}
}