1. The Core of an Economy with Non-Convex Preferences;Shapley,1963
2. R. J. Aumann. Integrals of set-valued functions. J. Math. Anal. Appl. in press.
3. H. W. Kuhn and A. W. Tucker. Non-linear programming. Proc. Second Berkeley Symp. Math. Statist. Probab., pp. 481–492.
4. “Linear Operators.” Part I;Dunford,1958
5. Convexity;Eggleston,1958