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 | 92 | 2007 |

Boundary-value problems for two-dimensional canonical systems S Hassi, H De Snoo, H Winkler Integral Equations and Operator Theory 36, 445-479, 2000 | 85 | 2000 |

The inverse spectral problem for canonical systems H Winkler Integral Equations and Operator Theory 22, 360-374, 1995 | 75 | 1995 |

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 | 53 | 2007 |

Direct and inverse spectral problems for generalized strings H Langer, H Winkler Integral Equations and Operator Theory 30 (4), 409-431, 1998 | 50 | 1998 |

Form sums of nonnegative selfadjoint operators S Hassi, A Sandovici, H de Snoo, H Winkler Acta Mathematica Hungarica 111, 81-105, 2006 | 42 | 2006 |

The Kato decomposition of quasi-Fredholm relations JP Labrousse, A Sandovici, HSV De Snoo, H Winkler Oper. Matrices 4 (1), 1-51, 2010 | 36 | 2010 |

Strings, dual strings, and related canonical systems M Kaltenbäck, H Winkler, H Woracek Mathematische Nachrichten 280 (13‐14), 1518-1536, 2007 | 30 | 2007 |

Linear relations and the Kronecker canonical form T Berger, C Trunk, H Winkler Linear Algebra and its Applications 488, 13-44, 2016 | 29 | 2016 |

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 | 27 | 2007 |

The structure of linear relations in Euclidean spaces A Sandovici, H De Snoo, H Winkler Linear algebra and its applications 397, 141-169, 2005 | 26 | 2005 |

Singularities of generalized strings M Kaltenbäck, H Winkler, H Woracek Operator Theory and Indefinite Inner Product Spaces: Presented on the …, 2005 | 23 | 2005 |

Canonical systems with a semibounded spectrum H Winkler Contributions to Operator Theory in Spaces with an Indefinite Metric: The …, 1998 | 23 | 1998 |

Generalized Nevanlinna functions with essentially positive spectrum M Kaltenbaeck, H Winkler, H Woracek Journal of Operator Theory, 17-48, 2006 | 21 | 2006 |

Almost Pontryagin spaces M Kaltenbäck, H Winkler, H Woracek Recent Advances in Operator Theory and its Applications: The Israel Gohberg …, 2005 | 21 | 2005 |

On transformations of canonical systems H Winkler Oper. Theory Adv. Appl 80, 276-288, 1995 | 21 | 1995 |

Two-dimensional Hamiltonian systems H Winkler Techn. Univ., Inst. für Mathematik, 2013 | 15 | 2013 |

On semibounded canonical systems H Winkler, H Woracek Linear algebra and its applications 429 (5-6), 1082-1092, 2008 | 15 | 2008 |

Finite rank perturbations of linear relations and matrix pencils L Leben, F Martínez Pería, F Philipp, C Trunk, H Winkler Complex Analysis and Operator Theory 15, 1-37, 2021 | 14 | 2021 |

Reparametrizations of non trace-normed Hamiltonians H Winkler, H Woracek Spectral Theory, Mathematical System Theory, Evolution Equations …, 2012 | 14 | 2012 |