This web page lists the references in my paper:

"A Monotonicity Property of Partial Orders" with D.J. Kleitman, Studies in Applied Mathematics, 65(1981), p. 81-83.

• R. L. Graham, A. C. Yao, and F. F. Yao, "Some monotonicity properties of partial orders", SIAM J. Alg. and Disc. Meth., 1:251-258 (1980).
• R. Ahlswede and D. E. Daykin, "An inequality for the weights of two families of sets, their unions and intersections", Z. Wahrscheinlichkeitstheorie und Verw. Gebiete, 43:183-185 (1978).