| Boundary relations and their Weyl families V Derkach, S Hassi, M Malamud, H De Snoo Transactions of the American Mathematical Society 358 (12), 5351-5400, 2006 | 193 | 2006 |
| Boundary value problems, Weyl functions, and differential operators J Behrndt, S Hassi, H De Snoo Springer Nature, 2020 | 164 | 2020 |
| Generalized resolvents of symmetric operators and admissibility HSV de Snoo, VA Derkach, S Hassi, MM Malamud Methods of Functional Analysis and Topology 6 (03), 24-55, 2000 | 140 | 2000 |
| Boundary relations and generalized resolvents of symmetric operators V Derkach, S Hassi, M Malamud, H de Snoo Russian Journal of Mathematical Physics 16 (1), 17-60, 2009 | 117 | 2009 |
| 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 |
| Componentwise and Cartesian decompositions of linear relations S Hassi, HSV de Snoo, FH Szafraniec arXiv preprint arXiv:0906.5406, 2009 | 80 | 2009 |
| On Kreĭn's extension theory of nonnegative operators S Hassi, M Malamud, H de Snoo Mathematische Nachrichten 274 (1), 40-73, 2004 | 75 | 2004 |
| On the class of extremal extensions of a nonnegative operator YM Arlinskiĭ, S Hassi, Z Sebestyén, HSV De Snoo Recent Advances in Operator Theory and Related Topics: The Béla Szökefalvi …, 2001 | 70 | 2001 |
| Lebesgue type decompositions for nonnegative forms S Hassi, Z Sebestyén, H de Snoo Journal of Functional Analysis 257 (12), 3858-3894, 2009 | 68 | 2009 |
| One-dimensional graph perturbations of selfadjoint relations S Hassi, H de Snoo Annales Fennici Mathematici 22 (1), 123-164, 1997 | 61 | 1997 |
| Selfadjoint extensions for a class of symmetric operators with defect numbers (1, 1) S Hassi, H Langer, HSV Snoo University of Groningen, Department of Mathematics and Computing Science, 1995 | 57 | 1995 |
| A canonical decomposition for linear operators and linear relations S Hassi, Z Sebestyén, H De Snoo, F Szafraniec Acta Mathematica Hungarica 115 (4), 281-307, 2007 | 55 | 2007 |
| Operator models associated with Kac subclasses of generalized Nevanlinna functions H de Snoo, V Derkach, S Hassi Methods of Functional Analysis and Topology 5 (01), 65-87, 1999 | 55 | 1999 |
| Boundary triplets and Weyl functions. Recent developments VA Derkach, S Hassi, MM Malamud, HSV de Snoo London Mathematical Society Lecture Note Series 1 (404), 161-220, 2012 | 54 | 2012 |
| 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 |
| Square‐integrable solutions and Weyl functions for singular canonical systems J Behrndt, S Hassi, H de Snoo, R Wietsma Mathematische Nachrichten 284 (11‐12), 1334-1384, 2011 | 47 | 2011 |
| Some interpolation problems of Nevanlinna-Pick type. The Kreĭn-Langer method S Hassi, H De Snoo, H Woracek Contributions to Operator Theory in Spaces with an Indefinite Metric: The …, 1998 | 47 | 1998 |
| On projections in a space with an indefinite metric S Hassi, K Nordström Linear algebra and its applications 208, 401-417, 1994 | 47 | 1994 |
| Singular perturbations of self-adjoint operators V Derkach, S Hassi, H de Snoo Mathematical Physics, Analysis and Geometry 6, 349-384, 2003 | 43 | 2003 |
| Form sums of nonnegative selfadjoint operators S Hassi, A Sandovici, H de Snoo, H Winkler Acta Mathematica Hungarica 111, 81-105, 2006 | 42 | 2006 |
