@article{JRAM_1851__42_183328,
     author = {H. Grassmann},
     title = {Die h\"ohere {Projectivit\"at} und {Perspectivit\"at} in der {Ebene;} dargestellt durch {Functionsverkn\"upfungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {204--212},
     year = {1851},
     volume = {42},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1851__42_183328/}
}