1. Kushner, H. J.,On the Status of Optimal Control and Stability for Stochastic Systems, IEEE International Convention Rec., Vol. 14, pp. 143?151, 1966.
2. Astrom, K. J.,Introduction to Stochastic Control Theory, Academic Press, New York, New York, 1970.
3. Lur'e, A. I.,Some Nonlinear Problems in the Theory of Automatic Control (in Russian), Gostekhizdat, Moscow, 1951.
4. Letov, A. M.,Stability of Nonlinear Regulating Systems (in Russian), Izdatel'stvo Tekhnichesko-Teoreticheskoi Literatury, Moscow, 1955.
5. Kalman, R. E., andBertram, J. E.,Control System Analysis and Design via the Second Method of Lyapunov, I: Continuous-Time Systems, Journal of Basic Engineering, Vol. 82, pp. 371?393, 1960.