1. N. N. Moiseev, Elements of the Theory of Optimal Systems (Nauka, Moscow, 1975) [in Russian].
2. R. P. Fedorenko, Approximate Solution of Optimal Control Problems (Nauka, Moscow, 1978) [in Russian].
3. F. P. Vasil’ev, Optimization Methods (Faktorial Press, Moscow, 2002) [in Russian].
4. A. G. Butkovskii, The Theory of Optimal Control of Systems with Distributed Parameters (Nauka, Moscow, 1965) [in Russian].
5. A. G. Butkovskii, Control Methods for Systems with Distributed Parameters (Nauka, Moscow, 1975) [in Russian].