@article{MAN_1967__171_161559,
     author = {H. WOLFF},
     title = {Minkowskische und absolute {Geometrie} {I.}},
     journal = {Mathematische Annalen},
     pages = {144--164},
     publisher = {mathdoc},
     volume = {171},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/MAN_1967__171_161559/}
}