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Translated from Sovremennaya Matematika. Fundamental’nye Napravleniya (Contemporary Mathematics. Fundamental Directions), Vol. 34, Proceedings of KROMSH, 2009.
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Skryabin, M.A. Partition of unity and the strong ellipticity problem for functional differential operators. J Math Sci 170, 270–282 (2010). https://doi.org/10.1007/s10958-010-0084-x
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DOI: https://doi.org/10.1007/s10958-010-0084-x