@article{MZ_1926__25_167896,
     author = {T. Rad\'o},
     title = {Das {Hilbertsche} {Theorem} \"uber den analytischen {Charakter} der {L\"osungen} der partiellen {Differentialgleichungen} zweiter {Ordnung}},
     journal = {Mathematische Zeitschrift},
     pages = {514--589},
     publisher = {mathdoc},
     volume = {25},
     year = {1926},
     zbl = {52.0480.05},
     url = {http://geodesic.mathdoc.fr/item/MZ_1926__25_167896/}
}