1. Multivalued Differential Equations;Deimling,1992
2. Inequalities in Mechanics and Physics;Duvaut,1976
3. Variational Principles and Free-Boundary Value Problems;Friedman,1982
4. Numerical Analysis of Variational Inequalities;Glowinski,1981
5. Numerical enclosure-methods for the weak solution of elliptic problems with unilateral constraints;Durucu;J. Math. Anal. Appl.,1994