Literature cited
I. P. Natanson, Theory of Functions of a Real Variable [in Russian], Gostekhizdat, Moscow-Leningrad (1950).
A. N. Filatov, Averaging Methods in Differential and Integrodifferential Equations [in Russian], Fan, Tashkent (1971).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 30, No. 2, pp. 226–228, March–April, 1978.
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Konstantinov, M.M. A functional inequality. Ukr Math J 30, 173–174 (1978). https://doi.org/10.1007/BF01085638
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DOI: https://doi.org/10.1007/BF01085638