1. V. Barbu and T. Precupanu, Convexity and Optimization in Banach Spaces, D. Reidel Publishing Company, Dordrecht, 1986.
2. H. Brézis, Problèmes unilatéraux, J. Math. Pures Appl.51 (1972), 1–168.
3. J. Cen, C. Min, M. Sofonea and S. Zeng, Generalized well-posedness results for a class of hemivariational inequalities, J. Math. Anal. Appl., 507 (2022), Paper No. 125839, 23 pp.
4. F.H. Clarke, Generalized gradients and applications, Trans. Amer. Math. Soc.205 (1975), 247–262.
5. F.H. Clarke, Optimization and Nonsmooth Analysis, Wiley, Interscience, New York, 1983.