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Translated from Matematicheskie Zametki, Vol. 50, No. 4, pp. 114–122, October, 1991.
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Taikov, L.V. Improvement of an inequality of Hardy containing an estimate of the size of an intermediate derivative of a function. Mathematical Notes of the Academy of Sciences of the USSR 50, 1062–1067 (1991). https://doi.org/10.1007/BF01137740
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DOI: https://doi.org/10.1007/BF01137740