@article{MAN_1954__128_160411,
     author = {H. Lenz},
     title = {\"Uber die {Einf\"uhrung} einer absoluten {Polarit\"at} in die {Projektive} und affine {Geometrie} des {Raumes.}},
     journal = {Mathematische Annalen},
     pages = {363--372},
     publisher = {mathdoc},
     volume = {128},
     year = {1954},
     zbl = {0056.13801},
     url = {http://geodesic.mathdoc.fr/item/MAN_1954__128_160411/}
}