Boundary-value problems for two-dimensional canonical systems S Hassi, H De Snoo, H Winkler Integral Equations and Operator Theory 36 (4), 445-479, 2000 | 77 | 2000 |

The inverse spectral problem for canonical systems H Winkler Integral Equations and Operator Theory 22 (3), 360-374, 1995 | 67 | 1995 |

Ascent, descent, nullity, defect, and related notions for linear relations in linear spaces A Sandovici, H de Snoo, H Winkler Linear algebra and its applications 423 (2-3), 456-497, 2007 | 59 | 2007 |

Direct and inverse spectral problems for generalized strings H Langer, H Winkler Integral Equations and Operator Theory 30 (4), 409-431, 1998 | 45 | 1998 |

A general factorization approach to the extension theory of nonnegative operators and relations S Hassi, A Sandovici, H De Snoo, H Winkler Journal of Operator Theory, 351-386, 2007 | 38 | 2007 |

Form sums of nonnegative selfadjoint operators S Hassi, A Sandovici, H de Snoo, H Winkler Acta Mathematica Hungarica 111 (1-2), 81-105, 2006 | 35 | 2006 |

The Kato decomposition of quasi-Fredholm relations JP Labrousse, A Sandovici, HSV De Snoo, H Winkler Oper. Matrices 4 (1), 1-51, 2010 | 29 | 2010 |

Strings, dual strings, and related canonical systems M Kaltenbäck, H Winkler, H Woracek Mathematische Nachrichten 280 (13‐14), 1518-1536, 2007 | 23 | 2007 |

Extremal extensions for the sum of nonnegative selfadjoint relations S Hassi, A Sandovici, H De Snoo, H Winkler Proceedings of the American Mathematical Society 135 (10), 3193-3204, 2007 | 21 | 2007 |

Singularities of generalized strings M Kaltenbäck, H Winkler, H Woracek Operator theory and indefinite inner product spaces, 191-248, 2005 | 21 | 2005 |

Generalized Nevanlinna functions with essentially positive spectrum M Kaltenbaeck, H Winkler, H Woracek Journal of Operator Theory, 17-48, 2006 | 20 | 2006 |

Canonical systems with a semibounded spectrum H Winkler Contributions to Operator Theory in Spaces with an Indefinite Metric, 397-417, 1998 | 20 | 1998 |

On Transformation of Canonical Systems H Winkler Operator theory and boundary eigenvalue problems, 276-288, 1995 | 19 | 1995 |

The structure of linear relations in Euclidean spaces A Sandovici, H De Snoo, H Winkler Linear algebra and its applications 397, 141-169, 2005 | 18 | 2005 |

Almost Pontryagin spaces M Kaltenbäck, H Winkler, H Woracek Recent advances in operator theory and its applications, 253-271, 2005 | 18 | 2005 |

Two-dimensional Hamiltonian systems H Winkler Techn. Univ., Inst. für Mathematik, 2013 | 13 | 2013 |

Zeros of nonpositive type of generalized Nevanlinna functions with one negative square H de Snoo, H Winkler, M Wojtylak Journal of mathematical analysis and applications 382 (1), 399-417, 2011 | 13 | 2011 |

On semibounded canonical systems H Winkler, H Woracek Linear algebra and its applications 429 (5-6), 1082-1092, 2008 | 13 | 2008 |

Reparametrizations of non trace-normed Hamiltonians H Winkler, H Woracek Spectral theory, mathematical system theory, evolution equations …, 2012 | 12 | 2012 |

Finite-dimensional graph perturbations of selfadjoint Sturm-Liouville operators S Hassi, HSV de Snoo, A Sterk, H Winkler Operator Theory, Structured Matrices, and Dilations: Tiberiu Constantinescu …, 2007 | 11 | 2007 |