@article{JMPA_1890_4_6__405_0,
     author = {Gutzmer, August},
     title = {Remarques sur certaines \'equations aux diff\'erences partielles d'ordre sup\'erieur},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {405--422},
     publisher = {Gauthier-Villars},
     volume = {4e s{\'e}rie, 6},
     year = {1890},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1890_4_6__405_0/}
}