Optimal control of linear bottleneck problems M. Bergounioux; F. Tröltzsch — 1998 ESAIM: Control, Optimisation and Calculus of Variations
Optimality conditions for state-constrained PDE control problems with time-dependent controls J. de Los Reyes; P. Merino; J. Rehberg; F. Tröltzsch — 2008 Control and Cybernetics
Lipschitz stability of solutions to parametric optimal control problems for parabolic equations. Malanowski, K.; Tröltzsch, F. — 1999 Zeitschrift für Analysis und ihre Anwendungen