1. Yu. G. Evtushenko, Methods for Solving Extremal Problems and their Application in Optimization Systems (Nauka, Moscow, 1982) [in Russian].
2. A. I. Egorov, Optimal Control of Thermal and Diffusion Processes (Nauka, Moscow, 1978) [in Russian].
3. I. V. Girsanov, Lectures on the Mathematical Theory of Extremum Problems (Springer, New York, 1972).
4. J. L. Lions, Optimal Control of Systems Governed by Partial Differential Equations (Springer, New York, 1971).
5. K. A. Lur’ye, Optimal Control in the Problems of Mathematical Physics (Nauka, Moscow, 1975) [in Russian].