1. Aumann R.J. (1965): Integrals of set-valued functions, J.Math.Anal. Appl. 12, 1–12
2. Bochner S. (1933): Integration von Funktionen, deren Werte die Elemente eines Vektorraumes sind, Fund. Math. 20, 262–276
3. Castaing C., M. Valadier (1977): Convex analysis and measurable multi-functions, Lecture Notes in Mathematics, Vol. 580, Berlin
4. Debreu G. (1967): Integration of correspondences, Proc. Fifth Berkeley Sympos. on Math. Statist, and Probability, Vol. II, Part I, 351–372
5. Dunford N., J.T. Schwartz (1958): Linear Operators, Part I; General Theory, New York