@article{JMPA_1938_9_17_1-4_187_0,
     author = {Janet, Maurice},
     title = {Sur le degr\'e de g\'en\'eralit\'e de la solution de certains syst\`emes d'\'equations aux d\'eriv\'ees partielles},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {187--195},
     publisher = {Gauthier-Villars},
     volume = {9e s{\'e}rie, 17},
     number = {1-4},
     year = {1938},
     zbl = {0018.40303},
     language = {fr},
     url = {http://archive.numdam.org/item/JMPA_1938_9_17_1-4_187_0/}
}