@article{CMH_1946__19_138898,
     author = {J.-P. Sydler},
     title = {Des hyperquadriques et droites associ\'es de l'espace \`a n dimensions.},
     journal = {Commentarii mathematici Helvetici},
     pages = {161--214},
     publisher = {mathdoc},
     volume = {19},
     year = {1946},
     url = {http://geodesic.mathdoc.fr/item/CMH_1946__19_138898/}
}