On the differentiability of solutions of elliptical differential equations
Doklady Akademii Nauk, Tome 112 (1957) no. 5, pp. 806-809.

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     author = {A. I. Koshelev},
     title = {On the differentiability of solutions of elliptical differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {806--809},
     publisher = {mathdoc},
     volume = {112},
     number = {5},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_112_5_a5/}
}
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A. I. Koshelev. On the differentiability of solutions of elliptical differential equations. Doklady Akademii Nauk, Tome 112 (1957) no. 5, pp. 806-809. http://geodesic.mathdoc.fr/item/DAN_1957_112_5_a5/