1. Asiminoaei, Ioan; Răşcanu, Aurel: are not cited in the text. Please provide the citation or delete them from the list. Approximation and simulation of stochastic variational inequalities—splitting up method, Numer. Funct. Anal. Optim. 18 (1997), no. 3-4, 251–282.
2. Barbu, Viorel: Nonlinear semigroups and differential equations in Banach spaces, Editura Academiei Republicii Socialiste România, Bucharest, 1976, Translated from the Romanian.
3. Barbu, Viorel: Optimal Control of Variational Inequalities, Pitman Research Notes in Mathematics, 100, London - Boston, 1984.
4. Barbu, Viorel: Mathematical Methods in Optimization of Differential Systems, Kluwer Academic Publishers, 1994.
5. Barbu, Viorel; Răşcanu, Aurel: Parabolic variational inequalities with singular inputs, Differential Integral Equations 10 (1997), no. 1, 67–83.