Gaussian filters for nonlinear filtering problems K Ito, K Xiong IEEE transactions on automatic control 45 (5), 910-927, 2000 | 1953 | 2000 |

The primal-dual active set strategy as a semismooth Newton method M Hintermüller, K Ito, K Kunisch SIAM Journal on Optimization 13 (3), 865-888, 2002 | 1261 | 2002 |

Lagrange multiplier approach to variational problems and applications K Ito, K Kunisch Society for Industrial and Applied Mathematics, 2008 | 850 | 2008 |

The immersed interface method: numerical solutions of PDEs involving interfaces and irregular domains Z Li, K Ito Society for Industrial and Applied Mathematics, 2006 | 728 | 2006 |

Primal-dual strategy for constrained optimal control problems M Bergounioux, K Ito, K Kunisch SIAM Journal on Control and Optimization 37 (4), 1176-1194, 1999 | 405 | 1999 |

A reduced-order method for simulation and control of fluid flows K Ito, SS Ravindran Journal of computational physics 143 (2), 403-425, 1998 | 400 | 1998 |

Level-set function approach to an inverse interface problem K Ito, K Kunisch, Z Li Inverse problems 17 (5), 1225, 2001 | 258 | 2001 |

Inverse problems: Tikhonov theory and algorithms K Ito, B Jin World Scientific, 2014 | 257 | 2014 |

Maximum principle preserving schemes for interface problems with discontinuous coefficients Z Li, K Ito SIAM Journal on Scientific Computing 23 (1), 339-361, 2001 | 226 | 2001 |

A unified framework for approximation in inverse problems for distributed parameter systems HT Banks, K Ito | 201 | 1988 |

The augmented Lagrangian method for parameter estimation in elliptic systems K Ito, K Kunisch SIAM Journal on Control and Optimization 28 (1), 113-136, 1990 | 192 | 1990 |

Semi–smooth Newton methods for variational inequalities of the first kind K Ito, K Kunisch ESAIM: Mathematical Modelling and Numerical Analysis 37 (1), 41-62, 2003 | 181 | 2003 |

Semi-smooth Newton methods for state-constrained optimal control problems K Ito, K Kunisch Systems & Control Letters 50 (3), 221-228, 2003 | 177 | 2003 |

A direct sampling method to an inverse medium scattering problem K Ito, B Jin, J Zou Inverse Problems 28 (2), 025003, 2012 | 176 | 2012 |

Augmented Lagrangian methods for nonsmooth, convex optimization in Hilbert spaces K Ito, K Kunisch Nonlinear Analysis: Theory, Methods & Applications 41 (5-6), 591-616, 2000 | 169 | 2000 |

Optimal controls of Navier–Stokes equations M Desai, K Ito SIAM Journal on Control and Optimization 32 (5), 1428-1446, 1994 | 159 | 1994 |

Evolution equations and approximations K Ito, F Kappel World Scientific, 2002 | 152 | 2002 |

Well posedness for damped second-order systems with unbounded input operators HT Banks, K Ito, Y Wang | 143 | 1995 |

Optimal control of elliptic variational inequalities K Ito, K Kunisch Applied Mathematics and Optimization 41, 343-364, 2000 | 137 | 2000 |

A reduced basis method for control problems governed by PDEs K Ito, SS Ravindran Control and Estimation of Distributed Parameter Systems: International …, 1998 | 136 | 1998 |