@article{ASENS_1942_3_59__211_0,
     author = {Vessiot, Ernest},
     title = {Sur les \'equations aux d\'eriv\'ees partielles de premier ordre, consid\'er\'ees comme des \'equations de contact et, en particulier, sur l'int\'egration des \'equations semi-lin\'eaires},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {211--273},
     publisher = {Elsevier},
     volume = {3e s{\'e}rie, 59},
     year = {1942},
     doi = {10.24033/asens.899},
     mrnumber = {6,174c},
     zbl = {0028.16001},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/asens.899/}
}