1. F.H. Clarke,Optimization and Nonsmooth Analysis (Wiley, New York, 1983).
2. V.F. Demyanov and A.M. Rubinov,Quasidifferential Calculus (Optimization Software, New York, 1986).
3. J.B. Hiriart-Urruty, “Miscellanies on nonsmooth analysis and optimization,” in: V.F. Demyanov and D. Pallaschke, eds.,Nondifferentiable Optimization: Motivations and Applications (Springer, Berlin, 1985).
4. H.Th. Jongen and D. Pallaschke, “On linearization and continuous selections of functions,”Optimization 19 (1988) 343–353.
5. L. Kuntz, “Implicit functions and regular points in quasidifferentiable optimization,” in: W. Oettli and D. Pallaschke, eds.,Advances in Operations Research (Springer, Berlin, 1992).