Ion Chryssoverghi
Discretization methods for semilinear parabolic optimal control problems.
Int. J. Numer. Anal. Mod., 3 (2006), pp. 437-458. Abstract
Xing XQ, Chen YP
L-infinity-error estimates for general optimal control problem by mixed finite element methods
INT J NUMER ANAL MOD, 5, 3(2008), pp. 441-456