1. N. N. Krassovskii and E. A. Lidskii, “Analytical design of controllers in systems with random attributes I, II, III,” Automation and Remote Control, vol. 22, 1961, 1021–1025, 1141–1146, 1289–1294.
2. J. J. Florentin, “Optimal control of continuous-time Markov, stochastic systems,” J. Electron. Control, vol. 10, 1961.
3. H. J. Kushner, “On the stochastic maximum principle: Fixed time of control,” J. Math. Anal. Appl., vol. 11, 1965, 78–92.
4. H. J. Kushner, Stochastic stability and control. Academic Press, New York, 1967.
5. F. Kozin, “A survey of stability of stochastic systems,” Automatical vol. 5, 1969, 95–112.