A definition of numerical range of rectangular matrices C Chorianopoulos, S Karanasios, P Psarrakos Linear and Multilinear Algebra 57 (5), 459-475, 2009 | 58 | 2009 |

On condition numbers of polynomial eigenvalue problems N Papathanasiou, P Psarrakos Applied Mathematics and Computation 216 (4), 1194-1205, 2010 | 50 | 2010 |

On the pseudospectra of matrix polynomials P Lancaster, P Psarrakos SIAM journal on matrix analysis and applications 27 (1), 115-129, 2005 | 50 | 2005 |

Birkhoff–James approximate orthogonality sets and numerical ranges C Chorianopoulos, P Psarrakos Linear algebra and its applications 434 (9), 2089-2108, 2011 | 48 | 2011 |

Perron–Frobenius type results on the numerical range J Maroulas, PJ Psarrakos, MJ Tsatsomeros Linear algebra and its applications 348 (1-3), 49-62, 2002 | 45 | 2002 |

A note on weak and strong linearizations of regular matrix polynomials P Lancaster, P Psarrakos Manchester Institute for Mathematical Sciences, University of Manchester, 2006 | 43 | 2006 |

The boundary of the numerical range of matrix polynomials J Maroulas, P Psarrakos Linear algebra and its applications 267, 101-111, 1997 | 43 | 1997 |

Numerical range of linear pencils PJ Psarrakos Linear Algebra and its Applications 317 (1-3), 127-141, 2000 | 37 | 2000 |

On pseudospectra of matrix polynomials and their boundaries L Boulton, P Lancaster, P Psarrakos Mathematics of computation 77 (261), 313-334, 2008 | 35 | 2008 |

Numerical range:(in) a matrix nutshell PJ Psarrakos, MJ Tsatsomeros Department of Mathematics, Washington State University, 2002 | 32 | 2002 |

On the m-th roots of a complex matrix P Psarrakos The Electronic Journal of Linear Algebra 9, 32-41, 2002 | 28 | 2002 |

On the shape of numerical range of matrix polynomials H Nakazato, P Psarrakos Linear Algebra and its Applications 338 (1-3), 105-123, 2001 | 28 | 2001 |

The numerical range of self-adjoint quadratic matrix polynomials P Lancaster, P Psarrakos SIAM journal on matrix analysis and applications 23 (3), 615-631, 2002 | 25 | 2002 |

A primer of Perron–Frobenius theory for matrix polynomials PJ Psarrakos, MJ Tsatsomeros Linear algebra and its applications 393, 333-351, 2004 | 23 | 2004 |

A method for the inverse numerical range problem C Chorianopoulos, P Psarrakos, F Uhlig The Electronic Journal of Linear Algebra 20, 2010 | 21 | 2010 |

Normal and seminormal eigenvalues of matrix functions P Lancaster, P Psarrakos Integral Equations and Operator Theory 41 (3), 331-342, 2001 | 19 | 2001 |

Almost skew-symmetric matrices JJ McDonald, PJ Psarrakos, MJ Tsatsomeros The Rocky Mountain Journal of Mathematics, 269-288, 2004 | 17 | 2004 |

Point equation of the boundary of the numerical range of a matrix polynomial MT Chien, H Nakazato, P Psarrakos Linear algebra and its applications 347 (1-3), 205-217, 2002 | 17 | 2002 |

The distance from a matrix polynomial to matrix polynomials with a prescribed multiple eigenvalue N Papathanasiou, P Psarrakos Linear algebra and its applications 429 (7), 1453-1477, 2008 | 16 | 2008 |

A note on weak and strong linearizations of regular matrix polynomials. MIMS EPrint 2006.72 P Lancaster, P Psarrakos Manchester Institute for Mathematical Sciences, The University of Manchester, UK, 2005 | 16 | 2005 |