1. Attouch, H., Variational Convergence for Functions and Operators, Pitman, Boston, 1984.
2. Auchmuty, G., Dual variational principles for eigenvalue problems, in Nonlinear Functional Analysis and Its Applications, F. Browder, ed., American Mathematical Society, Providence, RI, 1986, pp. 55?71.
3. Barbu, V., and Precupanu, T., Convexity and Optimization in Banach Spaces, Reidel, Boston, 1986.
4. Boccardo, L., and Marcellini, P., Sulla convergenza delle soluzioni di disequazioni variazionali, Ann. Mat. Pura Appl. 4(110), 1977, pp. 137?159.
5. Bourbaki, N., Topological Vector Spaces, Springer-Verlag, New York, 1987, Chapters 1?5.