1. Allen, G., Variational inequalities, complementarity problems and duality theorems, J. Math. Anal. Appl. 58, 1977, 1–10.
2. Aubin, J. P., Mathematical Methods of Game and Economic Theory, revised ed., Stud. Math. Appl., 7, North-Holland, Amsterdam 1982.
3. Baiocchi, C. and A. Capelo, Variational and Quasivariational Inequalities: Application to Free Boundary Problems, Wiley, New York 1984.
4. Barbu, V. and Th. Precupanu, Convexity and Optimization in Banach Spaces, Sijthoff and Nourdhoff, Bucarest, Romania 1986.
5. Bazarra, M. S., Goode, J. J. and M. Z. Nashed, A nonlinear complementarity problem in mathematical programming in Banach space, Proc. Am. Math. Soc. 35, 1972, 165–170.