@article{JMPA_1842_1_7__215_0, author = {Bertrand, J.}, title = {D\'emonstration d'un th\'eor\`eme de g\'eom\'etrie}, journal = {Journal de Math\'ematiques Pures et Appliqu\'ees}, pages = {215--216}, publisher = {Gauthier-Villars}, volume = {1e s{\'e}rie, 7}, year = {1842}, language = {fr}, url = {http://archive.numdam.org/item/JMPA_1842_1_7__215_0/} }