An inequality of Schur and an inequality of Newton
J. N. Whiteley, A generalization of a theorem of Newton, Proc. Amer. Math. Soc. 13 (1962), 144-151.
G. H. Hardy, J. E. Littlewood and G. Pólya, Inequalities, Cambridge Univ. Press, Cambridge, 1952, p. 52.
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