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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 4, pp. 499–510, April, 1989.
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Stepanets, A.I. Lebesgue's inequality on classes of (ψ, Β)-differentiable functions. Ukr Math J 41, 435–443 (1989). https://doi.org/10.1007/BF01060622
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DOI: https://doi.org/10.1007/BF01060622