1. Barbu, V. 1984:Optimal control of variational inequalities. Boston: Pitman
2. Barbu, V.; Korman, P. 1991: Approximating optimal control for elliptic obstacle problem by monotone iteration schemes.Numer. Func. Anal. Optimiz. 12, 429–442
3. Bazaraa, M.S.; Sherali, H.D.; Shetty, C.M. 1993:Nonlinear programming. Theory and algorithms. New York: John Wiley
4. Bergounioux, M. 1995: Optimal conditions for optimal control of elliptic problems governed by variational inequalities.Preprint, Université d'Orléans 95-01
5. Bermudez, A.; Saguez, C. 1985: Optimal control of variational inequalities.Control & Cybernetics 14, 9–30