@article{MZ_1926__25_167895,
     author = {S. Bernstein},
     title = {Sur la nature analytique des solutions des \'equations diff\'erentielles aux d\'eriv\'ees partielles du type elliptique. {Extrait} d'une correspondance avec {M.} {Rad\"o}},
     journal = {Mathematische Zeitschrift},
     pages = {505--513},
     publisher = {mathdoc},
     volume = {25},
     year = {1926},
     zbl = {52.0480.04},
     url = {http://geodesic.mathdoc.fr/item/MZ_1926__25_167895/}
}