1. C. Baiocchi and A. Capelo, Variational and Quasivariational Inequalities. Applications to Free Boundary Problems (Wiley, Chichester, 1984; Nauka, Moscow, 1988).
2. A. Bensoussan and J.-L. Lions, Impulse Control and Quasivariational Inequalities (Gauthier, Montrouge, 1984; Heyden, Philadelphia, PA, 1984; Nauka, Moscow, 1987).
3. M. A. Krasnosel’skii and P. P. Zabreiko, Geometric Methods of Nonlinear Analysis (Nauka, Moscow, 1975) [in Russian].
4. Yu. G. Borisovich, B. D. Gel’man, A. D. Myshkis, and V. V. Obukhovskii, Introduction to the Theory of Set-Valued Maps and Differential Inclusions (URSS, Moscow, 2005) [in Russian].
5. V. V. Fedorchuk and V. V. Filippov, General Topology. Basic Constructions (Izd. Mosk. Univ., Moscow, 1988) [in Russian].