1. N.U. Ahmed and K.L. Teo, Optimal Control of Distributed Parameters Systems, North-Holland Publishing Co., New York-Amsterdam, 1981.
2. J.-P. Aubin, Un theoreme de compacite, C. R. Hebd. Seances Acad. Sci.256 (1963), 5042--5044.
3. V. Barbu, Optimal Control of Variational Inequalities, Pitman (Advanced Publishing Program), Boston, MA, 1984.
4. M. Bokalo and O. Sus., Evolutionary variational inequalities with Volterra type operators, Mathematics and Statistics 7 (2019), 182--190.
5. M. Bokalo and A. Tsebenko, Optimal control for systems governed by parabolic equations without initial conditions with controls in the coefficients, Electron. J. Differential Equations 72 (2017), 1--22.