1. Venttsel’, E.S. and Ovcharov, L.A., Teoriya sluchainykh protsessov i ikh inzhenernye prilozheniya (Theory of Random Processes and Their Engineering Applications), Moscow: Knorus, 2016.
2. Averkin, A.N., Nechetkie mnozhestva v modelyakh upravleniya i iskusstvennogo intellekta (Fuzzy Sets in Models of Control and Artificial Intelligence), Moscow: Nauka, 1986.
3. Buckley, J.J., Eslami, E., and Feuring, T., Fuzzy Mathematics in Economics and Engineering, Heidelberg: Physica-Verl., 2002.
4. Pegat, A., Nechetkoe modelirovanie i upravlenie (Fuzzy Modeling and Control), Moscow: BINOM, Laboratoriya Znanii, 2015.
5. Aumann, R.J., Integrals of Set-Valued Functions, J. Math. Anal. Appl., 1965, no. 12, pp. 1–12.