@article{CMH_1937__10_138696,
     author = {N. Th\'eodoresco},
     title = {Les solutions \'el\'ementaires d'une classe d'\'equations aux d\'eriv\'ees partielles lin\'eaires d'ordre sup\'erieur.},
     journal = {Commentarii mathematici Helvetici},
     pages = {164--205},
     publisher = {mathdoc},
     volume = {10},
     year = {1937},
     zbl = {63.0447.01},
     url = {http://geodesic.mathdoc.fr/item/CMH_1937__10_138696/}
}