@article{MAN_1962__146_160941,
     author = {H. Lenz},
     title = {Inzidenzr\"aume mit {Orthogonalit\"at.}},
     journal = {Mathematische Annalen},
     pages = {369--374},
     publisher = {mathdoc},
     volume = {146},
     year = {1962},
     zbl = {0105.13301},
     url = {http://geodesic.mathdoc.fr/item/MAN_1962__146_160941/}
}