1. R. Gabasov and F. M. Kirillova, Qualitative Theory of Optimal Processes (Nauka, Moscow, 1971) [in Russian].
2. Yu. G. Evtushenko, Methods for Solving Extremal Problems and Their Application in Optimization Systems (Nauka, Moscow, 1982) [in Russian].
3. R. P. Fedorenko, Approximate Solution of Optimal Control Problems (Nauka, Moscow, 1978) [in Russian].
4. R. Gabasov, F. M. Kirillova, and A. I. Tyatyushkin, Constructive Optimization Methods, Part I: Linear Problems (Universitetskoe, Minsk, 1984) [in Russian].
5. A. I. Tyatyushkin, Numerical Methods and Software Tools for Optimization of Controlled Systems (Nauka, Novosibirsk, 1992) [in Russian].