1. N. N. Krasovskii and A. I. Subbotin, Positional Differential Games (Nauka, Moscow, 1974) [in Russian].
2. A. N. Tikhonov and V. Ya. Arsenin, Solutions of Ill-Posed Problems (Nauka, Moscow, 1979; Wiley, New York, 1981) [in Russian].
3. A. V. Kryazhimskii and Yu. S. Osipov, Izv. Akad. Nauk SSSR, Ser. Tekhn. Kibernet. 2, 51 (1983).
4. Yu. S. Osipov and A. V. Kryazhimskii, Inverse Problems for Ordinary Differential Equations: Dynamical Solutions (Gordon and Breach, London, 1995).
5. V. I. Maksimov, Automat. Remote Control 49(4), 413 (1988).