1. A. G. Butkovsky, Control Methods for Systems with Distributed Parameters [in Russian], Nauka, Moscow (1975).
2. A. I. Egorov, Foundations of Control Theory [in Russian], Fizmatlit, Moscow (2004).
3. T. K. Sirazetdinov, Optimization of Systems with Distributed Parameters [in Russian], Nauka, Moscow (1977).
4. J. L. Lions, Optimal Control of Systems Governed by Partial Differential Equations [Russian translation], Mir, Moscow (1972).
5. N. N. Moiseyev, Numerical Methods in the Theory of Optimal Systems [in Russian], Nauka, Moscow (1971).