@article{AFST_1931_3_23__139_0,
     author = {G. Pfeiffer},
     title = {Sur la permutation des int\'egrales d'une \'equation lin\'eaire et homog\`ene aux d\'eriv\'ees partielles du ordre},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {139--181},
     publisher = {\'Edouard Privat, Imprimeur-\'Editeur},
     address = {Toulouse},
     volume = {3e s{\'e}rie, 23},
     year = {1931},
     zbl = {0004.00903},
     language = {fr},
     url = {https://afst.centre-mersenne.org/item/AFST_1931_3_23__139_0/}
}