@article{JMPA_1857_2_2__353_0,
     author = {Lejeune-Dirichlet},
     title = {Simplification de la th\'eorie des formes binaires du second degr\'e \`a d\'eterminant positif},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {353--373},
     publisher = {Gauthier-Villars},
     volume = {2e s{\'e}rie, 2},
     year = {1857},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1857_2_2__353_0/}
}