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Translated from Matematicheskie Zametki, Vol. 49, No. 2, pp. 45–54, February, 1991.
I express my thanks to V. M. Tikhmirov and V. I. Burenkov for their interest in the present work.
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Zvyagintsev, A.I. Extremal problem of the norm of an intermediate derivative. Mathematical Notes of the Academy of Sciences of the USSR 49, 145–151 (1991). https://doi.org/10.1007/BF01137544
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DOI: https://doi.org/10.1007/BF01137544