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elliptic variational inequalities; mixed formulation; saddle point problem

References:

[1] F. Brezzi W. W. Hager P. A. Raviart: **Error estimates for the finite element solution of variational inequalities, Part II: Mixed methods**. Numerische Mathematik, 131, 1978, pp. 1-16. MR 0508584

[3] I. Ekeland R. Temam: **Analyse convexe et problèmes variationnels**. Dunod, 1974, Paris. MR 0463993

[4] R. Glowinski J. L. Lions R. Tremolieres: **Analyse numérique des inéquations variationnelles**. Vol. I., II. Dunod, 1976, Paris.

[5] J. Haslinger I. Hlaváček: **Approximation of the Signorini problem with friction by the mixed finite element method**. to appear in JMAA.

[6] J. Haslinger J. Lovíšek: **Mixed variational formulation of unilateral problems**. CMUC 21, 2 (1980), 231-246. MR 0580680

[7] J. Haslinger M. Tvrdý: **Numerical solution of the Signorini problem with friction by FEM**. to appear. MR 1355659