@article{JMPA_1888_4_4__349_0,
     author = {Jordan, Camille},
     title = {Sur les transformations d'une forme quadratique en elle-m\^eme},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {349--368},
     publisher = {Gauthier-Villars},
     volume = {4e s{\'e}rie, 4},
     year = {1888},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1888_4_4__349_0/}
}