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The work provides an upper estimate of the best accuracy for the problem ofreconstructing derivatives based on function values at a given number of pointsfor the functions of Besov classes meeting the mixed Hoelder conditions. Insome cases this estimate appears to be stronger than the earlier respectiveestimate obtained by the author in the problem being considered.

Upper estimate of the best accuracy of derivative reconstruction based on the values of functions of Besov classes with mixed smoothness