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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 40, No. 6, pp. 751–757, November–December, 1988.
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Mel'nik, Y.I. Inverse theorems for approximation of functions regular in convex polygons by exponential polynomials in the integral metric. Ukr Math J 40, 633–638 (1988). https://doi.org/10.1007/BF01057182
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DOI: https://doi.org/10.1007/BF01057182