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Translated from Matematicheskie Zametki, Vol. 55, No. 5, pp. 154–156, May, 1994.
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Shadrin, A.Y. Letter to the editor about A. I. Zvyagintsev's paper “Extremal problem on the norm of an intermediate derivative”. Math Notes 55, 543–545 (1994). https://doi.org/10.1007/BF02110383
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DOI: https://doi.org/10.1007/BF02110383