1. Fan, K.: A generalized of tychonoffs fixed point theorem. Math. Ann. 142, 305–310 (1961)
2. Fan, K.: A minimax inequality and applications. In: Shisha, O. (ed.) Inequality III, pp. 103–113. Academic Press, New York (1972)
3. Brezis, H., Nirenberg, L., Stampacchia, G.: A remark on Ky Fans minimax principle. Boll. della Unione Mat. Ital. 6, 293–300 (1972)
4. Blum, E., Oettli, W.: From optimization and variational inequalities to equilibrium problems. Math. Stud. 63, 123–145 (1994)
5. Flores-Bazan, F.: Existence theory for finite dimentional pseudomonotone equilibrium problems. Acta Appl. Math. 77, 249–297 (2003)