Control theory for partial differential equations: continuous and approximation theories I Lasiecka, R Triggiani Cambridge University Press, 2000 | 1042 | 2000 |

Non homogeneous boundary value problems for second order hyperbolic operators I Lasiecka, JL Lions, R Triggiani Journal de Mathématiques pures et Appliquées 65 (2), 149-192, 1986 | 549 | 1986 |

Differential and algebraic Riccati equations with application to boundary/point control problems: continuous theory and approximation theory I Lasiecka, R Triggiani Springer 164, xii+ 160, 1991 | 431 | 1991 |

Proof of extensions of two conjectures on structural damping for elastic systems SP Chen, R Triggiani Pacific Journal of Mathematics 136 (1), 15-55, 1989 | 379 | 1989 |

On the stabilizability problem in Banach space R Triggiani Journal of Mathematical Analysis and Applications 52 (3), 383-403, 1975 | 329 | 1975 |

Uniform stabilization of the wave equation with Dirichlet or Neumann feedback control without geometrical conditions I Lasiecka, R Triggiani Applied Mathematics and Optimization 25 (2), 189-224, 1992 | 249 | 1992 |

Inverse/observability estimates for second-order hyperbolic equations with variable coefficients I Lasiecka, R Triggiani, PF Yao Journal of Mathematical Analysis and Applications 235 (1), 13-57, 1999 | 232 | 1999 |

Exact controllability of semilinear abstract systems with application to waves and plates boundary control problems I Lasiecka, R Triggiani Applied Mathematics and Optimization 23 (1), 109-154, 1991 | 203 | 1991 |

A note on the lack of exact controllability for mild solutions in Banach spaces R Triggiani SIAM Journal on Control and Optimization 15 (3), 407-411, 1977 | 193 | 1977 |

Exact controllability of the wave equation with Neumann boundary control I Lasiecka, R Triggiani Applied Mathematics and Optimization 19 (1), 243-290, 1989 | 192 | 1989 |

Function space controllability of linear retarded systems: A derivation from abstract operator conditions A Manitius, R Triggiani SIAM Journal on Control and Optimization 16 (4), 599-645, 1978 | 192 | 1978 |

Algebraic Riccati equations with non-smoothing observation arising in hyperbolic and Euler-Bernoulli boundary control problems F Flandoli, I Lasiecka, R Triggiani Annali di Matematica Pura ed Applicata (1923-) 153 (1), 307-382, 1988 | 180 | 1988 |

A cosine operator approach to modeling L 2 (0, T; L 2 (Γ))—boundary input hyperbolic equations I Lasiecka, R Triggiani Applied mathematics and optimization 7 (1), 35-93, 1981 | 160 | 1981 |

Internal stabilization of Navier-Stokes equations with finite-dimensional controllers V Barbu, R Triggiani Indiana University mathematics journal, 1443-1494, 2004 | 158 | 2004 |

Regularity of hyperbolic equations under L 2 (0, T; L 2 (Γ))-Dirichlet boundary terms I Lasiecka, R Triggiani Applied Mathematics and Optimization 10 (1), 275-286, 1983 | 158 | 1983 |

Boundary feedback stabilizability of parabolic equations R Triggiani Applied Mathematics and Optimization 6 (1), 201-220, 1980 | 149 | 1980 |

Controllability and observability in Banach space with bounded operators R Triggiani SIAM Journal on Control 13 (2), 462-491, 1975 | 149 | 1975 |

Tangential boundary stabilization of Navier-Stokes equations V Barbu, I Lasiecka, R Triggiani American Mathematical Soc. 181 (852), 2006 | 143 | 2006 |

Carleman estimates with no lower-order terms for general Riemann wave equations. Global uniqueness and observability in one shot R Triggiani Applied Mathematics & Optimization 46 (2), 331-375, 2002 | 142 | 2002 |

Nonconservative wave equations with unobserved Neumann BC: Global uniqueness and observability in one shot I Lasiecka, R Triggiani, X Zhang Contemporary Mathematics 268, 227-326, 2000 | 136 | 2000 |