@article{AFST_1903_2_5_4_405_0,
     author = {\'E. Goursat},
     title = {Sur un probl\`eme relatif \`a la th\'eorie des \'equations aux d\'eriv\'ees partielles du second ordre},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {405--436},
     publisher = {\'Ed. Privat, Imprimeur-Libraire},
     address = {Toulouse},
     volume = {2e s{\'e}rie, 5},
     number = {4},
     year = {1903},
     language = {fr},
     url = {https://afst.centre-mersenne.org/item/AFST_1903_2_5_4_405_0/}
}