@article{JMPA_1886_4_2__329_0,
     author = {Picard, \'Emile},
     title = {Sur les int\'egrales de diff\'erentielles totales de seconde esp\`ece},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {329--372},
     publisher = {Gauthier-Villars},
     volume = {4e s{\'e}rie, 2},
     year = {1886},
     language = {fr},
     url = {http://archive.numdam.org/item/JMPA_1886_4_2__329_0/}
}