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Translated from Sovremennaya Matematika. Fundamental’nye Napravleniya (Contemporary Mathematics. Fundamental Directions), Vol. 54, Functional Differential Equations, 2014.
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Rossovskii, L.E. Elliptic Functional Differential Equations with Contractions and Extensions of Independent Variables of the Unknown Function. J Math Sci 223, 351–493 (2017). https://doi.org/10.1007/s10958-017-3360-1
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DOI: https://doi.org/10.1007/s10958-017-3360-1