@article{ASENS_1905_3_22__471_0,
     author = {Picard, \'Emile},
     title = {Sur les \'equations lin\'eaires aux d\'eriv\'ees partielles du second ordre},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {471--474},
     publisher = {Elsevier},
     volume = {3e s{\'e}rie, 22},
     year = {1905},
     doi = {10.24033/asens.558},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/asens.558/}
}