An inequality on doubly stochastic matrices
-  K. Knopp, Theory and applications of infinite series, 2nd English ed., Hafner, New York, 1947.
-  Herbert John Ryser, Combinatorial mathematics, The Carus Mathematical Monographs, No. 14, Published by The Mathematical Association of America; distributed by John Wiley and Sons, Inc., New York, 1963. MR 0150048
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