Second-Order Optimality Conditions for Boundary Control Problems with Mixed Pointwise Constraints. - Nguyen Hai Son; Bui Trong Kien; Arnd Rösch (SIAM J. Optim., 2016)

Upper semicontinuity of the solution map to a parametric boundary optimal control problem with unbounded constraint sets. - Nguyen Hai Son; Tuan Anh Dao (Optim. Lett., 2022)

FEM for Semilinear Elliptic Optimal Control with Nonlinear and Mixed Constraints. - Bui Trong Kien; Arnd Rösch; Nguyen Hai Son; Nguyen Van Tuyen (J. Optim. Theory Appl., 2023)