1. N. N. Krasovskii, Game Problems on the Encounter of Motions (Nauka, Moscow, 1970) [in Russian].
2. N. N. Krasovskii and A. I. Subbotin, Game-Theoretical Control Problems (Springer, New York, 1988).
3. A. B. Kurzhanski and P. Varaiya, “Dynamic optimization for reachability problems,” J. Optim. Theory Appl. 108 (2), 227–251 (2001).
4. F. H. Clarke, Yu. S. Ledyaev, R. J. Stern, and P. R.Wolenski, Nonsmooth Analysis and Control Theory (Springer, New York, 1998), Ser. Graduate Texts in Mathematics, Vol.178.
5. R. T. Rockafellar and R. J.-B. Wets, Variational Analysis, 2nd ed. (Springer, New York, 2004), Ser. Grundlehren der mathematischen Wissenschaften, Vol.317.