@article{JMPA_1926_9_5__347_0,
     author = {Riquier, Charles},
     title = {Sur quelques probl\`emes relatifs \`a l'\'equation aux d\'eriv\'ees partielles $\left(\frac{\delta^2}{\delta x^2}+\frac{\delta^2}{\delta y^2}\right)^nu=0$ (suite et fin)},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {347--393},
     publisher = {Gauthier-Villars},
     volume = {9e s{\'e}rie, 5},
     year = {1926},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1926_9_5__347_0/}
}