1. Yu. N. Kiselev, Optimal Control (Mosk. Gos. Univ., Moscow, 1988) [in Russian].
2. V. I. Blagodatskikh, Introduction to Optimal Control (Vysshaya Shkola, Moscow, 2001) [in Russian].
3. Yu. N. Kiselev, S. N. Avvakumov, and M. V. Orlov, Optimal Control. Linear Theory and Application (MAKS Press, Moscow, 2007) [in Russian].
4. R. T. Rockafeller, Convex Analysis (Princeton Univ. Press, Princeton, 1970; Mir, Moscow, 1973).