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Translated from Matematicheskie Zametki, Vol. 32, No. 1, pp. 3–7, July, 1982.
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Godunova, E.K., Levin, V.I. Lower bound for a cyclic sum. Mathematical Notes of the Academy of Sciences of the USSR 32, 481–483 (1982). https://doi.org/10.1007/BF01137219
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DOI: https://doi.org/10.1007/BF01137219