@article{MZ_1970__116_171372,
     author = {J\"urgen T\"olke},
     title = {Zur zentralaffinen r\"aumlichen {Kinematik.}},
     journal = {Mathematische Zeitschrift},
     pages = {71--78},
     publisher = {mathdoc},
     volume = {116},
     year = {1970},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__116_171372/}
}