@article{JMPA_1874_2_19__347_0,
     author = {Darboux, G.},
     title = {M\'emoire sur la th\'eorie alg\'ebrique des formes quadratiques},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {347--396},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 19},
     year = {1874},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1874_2_19__347_0/}
}