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2. A. M. Letov, Flight Dynamics and Control (Nauka, Moscow, 1969) [in Russian].
3. N. N. Krasovskii, Game Problems on Motions Meet (Nauka, Moscow, 1970) [in Russian].
4. J. Leitman, Introduction to Optimal Control Theory (Nauka, Moscow, 1968) [in Russian].
5. A. E. Bryson, and Ho, Yu-Chi, Applied Optimal Control (Blaisdell, Waltham, 1969; Mir, Moscow, 1972).