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D. London, “Two inequalities in nonnegative symmetric matrices,” Pac. J. Math.,16, No. 3, 515–536 (1966).
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Translated from Matematicheskie Zametki, Vol. 38, No. 3, pp. 376–377, September, 1985.
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Sidorenko, A.F. Proof of london's conjecture on sums of elements of positive matrices. Mathematical Notes of the Academy of Sciences of the USSR 38, 716–717 (1985). https://doi.org/10.1007/BF01163705
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DOI: https://doi.org/10.1007/BF01163705