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Translated from Matematicheskie Zametki, Vol. 33, No. 3, pp. 385–391, March, 1983.
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Ligun, A.A. Inequalities for norms of derivatives of periodic functions. Mathematical Notes of the Academy of Sciences of the USSR 33, 196–199 (1983). https://doi.org/10.1007/BF01686326
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DOI: https://doi.org/10.1007/BF01686326