1. Balder, E.J.: On a Useful Compactification for Optimal Control Problems. J. Math. Anal. Appl. 72 (1979), 391–398.
2. Bensoussan, A.: Points de Nash dans le cas de fonctionnelles quadratiques et jeux différentiels linéaires a n personnes. SIAM J. Control 12 (1974), 460–499.
3. Chawla, S.: A minmax problem for parabolic systems with competitive interactions. IMA Preprint Series No. 1448, Uni. Minnesota, Minneapolis, 1996.
4. Díaz, J.I., Lions, J.L.: On the approximate controllability of Stackelberg-Nash strategies. In: Proc. 2nd Diderot forum: Math. & Environment. Springer, 1999 (to appear).
5. Gabasov, R., Kirillova, F.: Qualitative Theory of Optimal Processes. Nauka, Moscow, 1971.