Submodularity, Supermodularity, and Higher-Order Monotonicities of Pseudo-Boolean Functions.

Stephan Foldes Peter L. Hammer Submodularity, Supermodularity, and Higher-Order Monotonicities of Pseudo-Boolean Functions. 453-461 2005 30 Math. Oper. Res. 2 http://dx.doi.org/10.1287/moor.1040.0128 db/journals/mor/mor30.html#FoldesH05