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Translated from Sovremennaya Matematika. Fundamental’nye Napravleniya (Contemporary Mathematics. Fundamental Directions), Vol. 39, Partial Differential Equations, 2011.
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Popov, V.A., Skubachevskii, A.L. Smoothness of generalized solutions of elliptic differential-difference equations with degenerations. J Math Sci 190, 135–146 (2013). https://doi.org/10.1007/s10958-013-1249-1
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DOI: https://doi.org/10.1007/s10958-013-1249-1