@article{AFST_1899_2_1_1_31_0,
     author = {E. Goursat},
     title = {Recherches sur quelques \'equations aux d\'eriv\'ees partielles du second ordre},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {31--78},
     publisher = {\'Ed. Privat, Imprimeur-Libraire},
     address = {Toulouse},
     volume = {2e s{\'e}rie, 1},
     number = {1},
     year = {1899},
     language = {fr},
     url = {https://afst.centre-mersenne.org/item/AFST_1899_2_1_1_31_0/}
}