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@article{MAN_1878__13_156816, author = {Grassmann}, title = {Zur {Theorie} der reciproken {Radien.} {(Der} {Kgl.} {S\"achs.} {Ges.} d. {Wiss.} mitgetheilt von {C.} {Neumann)}}, journal = {Mathematische Annalen}, pages = {559--560}, publisher = {mathdoc}, volume = {13}, year = {1878}, zbl = {10.0554.03}, url = {http://geodesic.mathdoc.fr/item/MAN_1878__13_156816/} }
Grassmann. Zur Theorie der reciproken Radien. (Der Kgl. Sächs. Ges. d. Wiss. mitgetheilt von C. Neumann). Mathematische Annalen, Tome 13 (1878), pp. 559-560. http://geodesic.mathdoc.fr/item/MAN_1878__13_156816/