@article{JMPA_1937_9_16_1-4_361_0,
     author = {Vranceanu, G.},
     title = {La g\'eom\'etrisation des \'equations aux d\'eriv\'ees partielles du second ordre},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {361--374},
     publisher = {Gauthier-Villars},
     volume = {9e s{\'e}rie, 16},
     number = {1-4},
     year = {1937},
     zbl = {0017.35103},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1937_9_16_1-4_361_0/}
}