@article{JMPA_1875_3_1__241_0,
     author = {All\'egret},
     title = {M\'emoire sur l'int\'egration des \'equations aux d\'eriv\'ees partielles du premier ordre},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {241--262},
     publisher = {Gauthier-Villars},
     volume = {3e s{\'e}rie, 1},
     year = {1875},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1875_3_1__241_0/}
}