1. R. Bellman and K. Cooke, Differential-Difference Equations (New York, 1963; Nauka, Moscow, 1967).
2. L. S. Pontryagin, Selected Scientific Works, Vol. 2: Differential Equations. Operator Theory. Optimal Control. Differential Games, Edited with a foreword by R. V. Gamkrelidze (Nauka, Moscow, 1988) [in Russian].
3. J. Warga Optimal Control of Differential and Functional Equations (Academic Press, New York-London, 1972; Nauka, Moscow, 1977).
4. N. L. Grigorenko, Mathematical Methods of Control of several Dynamical Processes (Izd. Moskovsk. Univ., Moscow, 1990) [in Russian].
5. N. V. Tsvetkova, Linear Game of Pursuit with Geometric and Integral Constraints, Available from VINITI, No. 51–81 (1981) [in Russian].