1. Letov, A.M., Analytical Controller Design, I–III, Autom. Remote Control, 1960, vol. 21, no. 4, pp. 303–306; no. 5, pp. 389–393; no. 6, pp. 458–461.
2. Kwakernaak, H. and Sivan, R., Linear Optimal Control Systems, New York: Wiley, 1972. Translated under the title Lineinye optimal’nye sistemy upravleniya, Moscow: Mir, 1977.
3. Belkina, T.A. and Rotar’, V.I., On Optimality in Probability and Almost Surely for Processes with a Communication Property. I. The Discrete Time Case, Theor. Veroyat. Primen., 2005, vol. 50, no. 1, pp. 3–26.
4. Belkina, T.A., Kabanov, Yu.M., and Presman, E.L., On a Stochastic Optimality of the Feedback Control in the LQG-Problem, Theor. Veroyat. Primen., 2003, vol. 48, no. 1, pp. 661–675.
5. Leizarowitz, A., Controlled Diffusion Processes on Infinite Horizon with the Overtaking Criterion, Appl. Math. Optim., 1988, vol. 17, no. 1, pp. 61–78.