1. Asplund, E. and Rockafellar, R. T.: Gradients of convex functions,Trans. Amer. Math. Soc. 139 (1969), 443?467.
2. Attouch, H.:Variational Convergence for Functions and Operators, Pitman, Boston, 1984.
3. Attouch, H., Azé, D. and Beer, G.: On some inverse stability problems for the epigraphical sum, Preprint (1989), to appear inJ. Nonlinear Anal.
4. Attouch, H., Lucchetti, R. and Wets, R. J.-B.: The topology of the ?-Hausdorff distance,Annal. Mat. Pura Appl. 4 160 (1991), 303?320.
5. Attouch, H., Moudafi, A., and Riahi, H.: Quantitative stability analysis for maximal monotone operators and semi-groups of contractions,Sem. Anal. Conv. Montpellier 9 (1991), 1?38.