1. D. Kinderlehrer and G. Stampacchia, “An introduction to vatiational inequalities and their applications,” SIAM Review, 23, No. 4, 539–543 (1981).
2. C. Baiocchi and A. Capelo, Variational and Quasivariational Inequalities: Applications to Free-Boundary Problems, Wiley & Sons (1984).
3. A. Nagurney, Network Economics: A Variational Inequality Approach, Kluwer Academic Publishers, Dordrecht (1999).
4. V. V. Semenov and N. V. Semenova, “A vector problem of optimal control in a Hilbert space,” Cybern. Syst. Analysis, 41, No. 2, 255–266 (2005).
5. A. B. Bakushinskii and A. V. Goncharskii, Ill-Posed Problems. Numerical Methods and Applications [in Russian], Izd-vo MGU, Moscow (1989).