Kaczmarz extended algorithm for tomographic image reconstruction from limited-data C Popa, R Zdunek Mathematics and Computers in Simulation 65 (6), 579-598, 2004 | 105 | 2004 |

Extensions of block-projections methods with relaxation parameters to inconsistent and rank-deficient least-squares problems C Popa BIT Numerical Mathematics 38 (1), 151-176, 1998 | 81 | 1998 |

Least-squares solution of overdetermined inconsistent linear systems using Kaczmarz's relaxation C Popa International journal of computer mathematics 55 (1-2), 79-89, 1995 | 60 | 1995 |

Single projection Kaczmarz extended algorithms S Petra, C Popa Numerical Algorithms 73 (3), 791-806, 2016 | 33 | 2016 |

Projection algorithms-classical results and developments: Applications to image reconstruction C Popa LAP, Lambert Academic Pub., 2012 | 33 | 2012 |

On Kaczmarz’s projection iteration as a direct solver for linear least squares problems C Popa, T Preclik, H Köstler, U Rüde Linear Algebra and Its Applications 436 (2), 389-404, 2012 | 26 | 2012 |

Characterization of the solutions set of inconsistent least-squares problems by an extended Kaczmarz algorithm C Popa Korean Journal of Computational and Applied Mathematics 6 (1), 51-64, 1999 | 26 | 1999 |

Convergence rates for Kaczmarz-type algorithms C Popa Numerical Algorithms 79 (1), 1-17, 2018 | 22 | 2018 |

A method for improving orthogonality of rows and columns of matrices C Popa International journal of computer mathematics 77 (3), 469-480, 2001 | 18 | 2001 |

Constrained Kaczmarz extended algorithm for image reconstruction C Popa Linear Algebra and its Applications 429 (8-9), 2247-2267, 2008 | 16 | 2008 |

Penalized least-squares image reconstruction for borehole tomography C Popa, R Zdunek Proceedings of ALGORITMY 2005 Conference, Vysoke Tatry–Podbanske, Slovakia …, 2005 | 15 | 2005 |

A hybrid Kaczmarz–Conjugate Gradient algorithm for image reconstruction C Popa Mathematics and Computers in Simulation 80 (12), 2272-2285, 2010 | 14 | 2010 |

Extension of an approximate orthogonalization algorithm to arbitrary rectangular matrices C Popa Linear algebra and its applications 331 (1-3), 181-192, 2001 | 14 | 2001 |

Block-projections algorithms with blocks containing mutually orthogonal rows and columns C Popa BIT Numerical Mathematics 39 (2), 323-338, 1999 | 14 | 1999 |

Interpolation and related coarsening techniques for the algebraic multigrid method G Golubovici, C Popa Multigrid Methods IV, 201-213, 1994 | 13 | 1994 |

Extended and constrained diagonal weighting algorithm with application to inverse problems in image reconstruction C Popa Inverse Problems 26 (6), 065004, 2010 | 12 | 2010 |

Preconditioning conjugate gradient method for nonsymmetric systems C Popa International journal of computer mathematics 58 (1-2), 117-133, 1995 | 12 | 1995 |

Nonlinear multigrid methods for numerical solution of the variably saturated flow equation in two space dimensions G Juncu, A Nicola, C Popa Transport in porous media 91 (1), 35-47, 2012 | 11 | 2012 |

Extended and Constrained Cimmino-type Algorithms with Applications in Tomographic Image Reconstruction S Petra, C Popa, C Schnörr | 11 | 2008 |

A general extending and constraining procedure for linear iterative methods A Nicola, S Petra, C Popa, C Schnörr International Journal of Computer Mathematics 89 (2), 231-253, 2012 | 10 | 2012 |