1. Alart P. and Curnier A., A mixed formulation for frictional contact problems prone to Newton like solution methods.Comput. Methods Appl. Mech. Eng.92(1991) 353–375.
2. C. Baiocchi and A. Capelo,Variational and Quasivariational Inequalities: Applications to Free-Boundary Problems. John Wiley, Chichester (1984).
3. Barboteu M. and Sofonea M., Modelling and analysis of the unilateral contact of a piezoelectric body with a conductive support.J. Math. Anal. Appl.358(2009) 110–124.
4. Barboteu M. and Sofonea M., Analysis and numerical approach of a piezoelectric contact problem.Annals of the Academy of Romanian Scientists, Series on Mathematics and its Applications1(2009) 7–31.
5. D. Braess,Finite Elements: Theory, Fast Solvers, and Applications in Solid Mechanics, 3rd edn. Cambridge University Press, Cambridge (2007).