@article{MAN_1958__135_160624,
     author = {H.-G. Zimmer},
     title = {\"Uber {Quadrate} der affinen {Rechtwinkelgeometrie.}},
     journal = {Mathematische Annalen},
     pages = {340--351},
     publisher = {mathdoc},
     volume = {135},
     year = {1958},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1958__135_160624/}
}