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Mordell, L.J. On the inequality \(\sum\limits_{r = 1} {x_r /(x_{r + 1} + x_{r + 2} ) \geqslant n/2} \) and some othersand some others. Abh.Math.Semin.Univ.Hambg. 22, 229–241 (1958). https://doi.org/10.1007/BF02941955
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DOI: https://doi.org/10.1007/BF02941955