@article{JRAM_1967__228_150812,
     author = {Heinrich Brauner},
     title = {Geometrie des zweifach isotropen {Raumes.} {III.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {38--70},
     publisher = {mathdoc},
     volume = {228},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1967__228_150812/}
}