@article{JMPA_1854_1_19__215_0,
     author = {Bazin},
     title = {Sur la composition des formes quadratiques \`a quatre variables},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {215--252},
     publisher = {Gauthier-Villars},
     volume = {1e s{\'e}rie, 19},
     year = {1854},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1854_1_19__215_0/}
}