@article{JMPA_1838_1_3__44_0,
     author = {Jacobi},
     title = {Sur le {Calcul} des {Variations} et sur la {Th\'eorie} des {\'Equations} diff\'erentielles},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {44--59},
     publisher = {Gauthier-Villars},
     volume = {1e s{\'e}rie, 3},
     year = {1838},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1838_1_3__44_0/}
}