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@article{JRAM_1851__42_183334, author = {Ch. Graves}, title = {Elementary geometrical proof of {Joachimsthal} theorem.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {279--279}, publisher = {mathdoc}, volume = {42}, year = {1851}, language = {en}, url = {http://geodesic.mathdoc.fr/item/JRAM_1851__42_183334/} }
Ch. Graves. Elementary geometrical proof of Joachimsthal theorem.. Journal für die reine und angewandte Mathematik, Tome 42 (1851), p. 279. http://geodesic.mathdoc.fr/item/JRAM_1851__42_183334/