1. Attouch, H.: Variational Convergence for Functions and Operators. Pitman, Boston (1984)
2. Attouch, H., Wets, J.R.: Approximation and convergence in nonlinear optimization. In: Nonlinear Programming, pp. 367–394. Academic Press, New York (1981)
3. Attouch, H., Wets, J.R.: A convergence theory for saddle functions. Trans. Am. Math. Soc. 280, 1–41 (1983)
4. Attouch, H., Wets, J.R.: Convergence des points min/sup et de points fixes. C. R. Acad. Sci. Paris 296, 657–660 (1983)
5. Aubin, J.P., Frankowska, H.: Set-Valued Analysis. Birkhäuser, Boston (1990)