1. Theory of capacities;Choquet;Ann. Inst. Fourier,1953
2. Submodular functions, matroids, and certain polyhedra;Edmonds,1969
3. Submodular set functions;Edmonds,1966
4. ]On a lattice with a valuation;Hashimoto;Proc. Am. Math. Soc.,1952
5. The kernel and bargaining set for convex games;Maschler;The Rand Corporation RM-5372-PR,1967