Optimal control of partial differential equations: theory, methods, and applications F Tröltzsch American Mathematical Soc., 2010 | 1197 | 2010 |

Optimale Steuerung partieller Differentialgleichungen F Tröltzsch Vieweg, Wiesbaden, 2005 | 408 | 2005 |

Error estimates for the numerical approximation of a semilinear elliptic control problem N Arada, E Casas, F Tröltzsch Computational Optimization and Applications 23 (2), 201-229, 2002 | 304 | 2002 |

Optimal control of partial differential equations, volume 112 of Graduate Studies in Mathematics F Tröltzsch American Mathematical Society, Providence, RI, 2010 | 212 | 2010 |

POD a-posteriori error estimates for linear-quadratic optimal control problems F Tröltzsch, S Volkwein Computational Optimization and Applications 44 (1), 83, 2009 | 154 | 2009 |

Optimal control of PDEs with regularized pointwise state constraints C Meyer, A Rösch, F Tröltzsch Computational Optimization and Applications 33 (2-3), 209-228, 2006 | 154 | 2006 |

Error estimates for the numerical approximation of boundary semilinear elliptic control problems E Casas, M Mateos, F Tröltzsch Computational Optimization and Applications 31 (2), 193-219, 2005 | 142 | 2005 |

Sufficient second-order optimality conditions for semilinear control problems with pointwise state constraints E Casas, JC De Los Reyes, F Tröltzsch SIAM Journal on Optimization 19 (2), 616-643, 2008 | 126 | 2008 |

Optimality conditions for parabolic control problems and applications F Tröltzsch BG Teubner, 1984 | 112 | 1984 |

Second-order necessary and sufficient optimality conditions for optimization problems and applications to control theory E Casas, F Tröltzsch SIAM Journal on Optimization 13 (2), 406-431, 2002 | 108 | 2002 |

Second order sufficient optimality conditions for some state-constrained control problems of semilinear elliptic equations E Casas, F Tröltzsch, A Unger SIAM Journal on Control and Optimization 38 (5), 1369-1391, 2000 | 108 | 2000 |

Second order sufficient optimality conditions for nonlinear parabolic control problems with state constraints JP Raymond, F Troltzsch Discrete and Continuous Dynamical Systems 6 (2), 431-450, 2000 | 104 | 2000 |

Second order sufficient optimality conditions for a nonlinear elliptic boundary control problem E Casas, F Tröltzsch, A Unger Zeitschrift für Analysis und ihre Anwendungen 15 (3), 687-707, 1996 | 96 | 1996 |

On two numerical methods for state-constrained elliptic control problems C Meyer, U Prüfert, F Tröltzsch Optimisation Methods and Software 22 (6), 871-899, 2007 | 89 | 2007 |

Second-order sufficient optimality conditions for a class of nonlinear parabolic boundary control problems H Goldberg, F Tröltzsch SIAM journal on control and optimization 31 (4), 1007-1025, 1993 | 82 | 1993 |

Regular Lagrange multipliers for control problems with mixed pointwise control-state constraints F Tröltzsch SIAM Journal on Optimization 15 (2), 616-634, 2005 | 81 | 2005 |

Second-order necessary optimality conditions for some state-constrained control problems of semilinear elliptic equations E Casas, F Tröltzsch Applied Mathematics and Optimization 39 (2), 211-227, 1999 | 81 | 1999 |

Fast solution of optimal control problems in the selective cooling of steel A Unger, F Tröltzsch ZAMM‐Journal of Applied Mathematics and Mechanics/Zeitschrift für Angewandte …, 2001 | 80 | 2001 |

Semidiscrete Ritz-Galerkin approximation of nonlinear parabolic boundary control problems—strong convergence of optimal controls F Tröltzsch Applied Mathematics and Optimization 29 (3), 309-329, 1994 | 75 | 1994 |

Error estimates for the discretization of state constrained convex control problems: Error estimates for the discretization D Tiba, F Tröltzsch Numerical functional analysis and optimization 17 (9-10), 1005-1028, 1996 | 74 | 1996 |