Literature cited
E. K. Godunova and V. I. Levin, “A sharpening of certain cyclic inequalities,” Matem. Zametki,14, No. 3, 305–316 (1973).
V. G. Drinfel'd, “On a cyclic inequality,” Matem. Zametki,9, No. 2, 113–119 (1971).
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Translated from Matematicheskie Zametki, Vol. 20, No. 2, pp. 203–205, August, 1976.
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Godunova, E.K., Levin, V.I. Exactness of a nontrivial estimate in a cyclic inequality. Mathematical Notes of the Academy of Sciences of the USSR 20, 673–675 (1976). https://doi.org/10.1007/BF01155872
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DOI: https://doi.org/10.1007/BF01155872