@article{AFST_1918_3_10__65_0,
     author = {E. Goursat},
     title = {Sur le probl\`eme de {B\"acklund} et les syst\`emes de deux \'equations de {Pfaff}},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {65--173},
     year = {1918},
     publisher = {Gauthier-Villars, Imprimeur-\'Editeur},
     address = {Paris},
     volume = {3e s{\'e}rie, 10},
     doi = {10.5802/afst.307},
     language = {fr},
     url = {https://afst.centre-mersenne.org/articles/10.5802/afst.307/}
}