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Translated from Matematicheskie Zametki, Vol. 32, No. 6, pp. 823–834, December, 1982.
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Buslaev, A.P., Magaril-Il'yaev, G.G. & Tikhomirov, V.M. Existence of extremal functions in inequalities for derivatives. Mathematical Notes of the Academy of Sciences of the USSR 32, 898–904 (1982). https://doi.org/10.1007/BF01145874
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DOI: https://doi.org/10.1007/BF01145874