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2. V. G. Boltyanskii, Mathematical Methods of Optimal Control [in Russian], Nauka, Moscow (1969).
3. N. N. Krasovskii, Game Problems in Moving Encounters [in Russian], Nauka, Moscow (1970).
4. N. N. Krasovskii, ?Differential games of approach and deflection. I, II,? Izv. Akad. Nauk SSSR, Ser. Tekh. Kibern., No. 2, 3?18 (1973); No. 3, 22?42 (1973).
5. N. N. Krasovskii, ?On the deflection problem in game theory,? Dlff. Uravn.,8, No. 2, 243?248 (1972).