@article{JMPA_1859_2_4__389_0,
     author = {Lejeune-Dirichlet, G.},
     title = {De la composition des formes binaires du second degr\'e},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {389--398},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 4},
     year = {1859},
     language = {fr},
     url = {http://archive.numdam.org/item/JMPA_1859_2_4__389_0/}
}