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@article{JRAM_1893__111_148892, author = {Arthur Cayley}, title = {On {Halphen's} {Characteristic} n, in the theory of {Curves} in {Space.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {347--352}, publisher = {mathdoc}, volume = {111}, year = {1893}, zbl = {25.1232.01}, url = {http://geodesic.mathdoc.fr/item/JRAM_1893__111_148892/} }
Arthur Cayley. On Halphen's Characteristic n, in the theory of Curves in Space.. Journal für die reine und angewandte Mathematik, Tome 111 (1893), pp. 347-352. http://geodesic.mathdoc.fr/item/JRAM_1893__111_148892/