1. Integrals of set-valued functions;Aumann;J. Math. Anal. Appl.,1965
2. Convex Analysis and Measurable Multifunctions;Castaing,1977
3. Integration of correspondence;Debreu,1966
4. Theory of Correspondences;Klein,1984
5. The fuzzy integral;Ralescu;J. Math. Anal. Appl.,1980