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@article{MAN_1873__6_156626, author = {Sturm}, title = {Das {Problem} der r\"aumlichen {Projectivit\"at.}}, journal = {Mathematische Annalen}, pages = {513--550}, publisher = {mathdoc}, volume = {6}, year = {1873}, zbl = {06.0375.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1873__6_156626/} }
Sturm. Das Problem der räumlichen Projectivität.. Mathematische Annalen, Tome 6 (1873), pp. 513-550. http://geodesic.mathdoc.fr/item/MAN_1873__6_156626/