Institute of Computational Mathematics & Information Technology;
Kazan Federal University;
Kazan;
Russia;
Tianjin University of Finance and Economics;
Tianjin;
China;
Department of Mathematical Sciences;
University of Oulu;
Oulu;
Finland;
Parabolic; Optimal; Control; State; Constraints; Finite; Difference; Method; Constrained; Saddle; Point; Problem; Iterative; Method;