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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 2, pp. 204–209, March–April, 1987.
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Pereverzev, S.V. Approximation numbers and approximation of the eigenvalues of integral operators. Ukr Math J 39, 171–175 (1987). https://doi.org/10.1007/BF01057499
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DOI: https://doi.org/10.1007/BF01057499