1. Integrals of set-valued functions;Aumann;J. Math. Anal. Appl.,1965
2. Convex Analysis and Measurable Multifunction;Castaing,1977
3. Towards fuzzy differential calculus. Part I;Dubois;Fuzzy Sets and Systems,1982
4. Fuzzy Sets and Systems — Theory and Applications;Dubois,1980
5. Theory of Correspondences;Klein,1984