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@article{MAN_1940__117_160068, author = {G. Tautz}, title = {Zur {Theorie} der elliptischen {Differentialgleichungen.} {I.}}, journal = {Mathematische Annalen}, pages = {694--726}, publisher = {mathdoc}, volume = {117}, year = {1940}, zbl = {67.0353.02}, url = {http://geodesic.mathdoc.fr/item/MAN_1940__117_160068/} }
G. Tautz. Zur Theorie der elliptischen Differentialgleichungen. I.. Mathematische Annalen, Tome 117 (1940), pp. 694-726. http://geodesic.mathdoc.fr/item/MAN_1940__117_160068/