“…The direct problem in this setting is to solve the variational or quasi-variational inequality. In contrast, the inverse problem seeks the coefficient from an estimate of the solution of the associated variational problem, see [4,9,17]. Recently, vector variational and vector quasi-variational inequalities appeared as natural and essential generalizations of variational and quasi-variational inequalities, see [7,12,14,18,20,21,22,24,25].…”