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1.P.R.adby and M.A. Dempster, Introduction to optimization methods, Chapman and Hall, London, 1974. 2.J.-P. Aubin, Optima and equilibra: an introduction to nonlinear analysis, Springer, Berlin, 1993. 3.F.H.Clarke, Optimization and nonsmooth analysis, Wiley, New York, 1983.
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