@article{MZ_1955__62_169493,
     author = {Helmut Karzel},
     title = {Ordnungsfunktionen in nichtdesarguesschen projektiven {Geometrien.}},
     journal = {Mathematische Zeitschrift},
     pages = {268--291},
     publisher = {mathdoc},
     volume = {62},
     year = {1955},
     zbl = {0066.38803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1955__62_169493/}
}