@article{JMPA_1872_2_17__403_0,
     author = {Mannheim, A.},
     title = {D\'emonstration g\'eom\'etrique d'une proposition due \`a {M.} {Bertrand}},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {403--405},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 17},
     year = {1872},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1872_2_17__403_0/}
}