| 2013 |
Products of generalized Nevanlinna functions with symmetric rational functions |
Hassi, S.; Wietsma, H.L. |
| 2013 |
Unitary equivalence of proper extensions of a symmetric operator and the Weyl function |
Hassi, Seppo; Mark Malamud; Vadim Mogilevskii |
| 2013 |
On J-self-adjoint operators with stable C-symmetries |
Hassi, Seppo; Kuzhel, Sergii |
| 2013 |
Linear fractional transformations of Nevanlinna functions associated with a nonnegative operator |
Behrndt, Jussi; Hassi, Seppo; de Snoo, Henk; Wietsma, Rudi; Winkler, Henrik |
| 2012 |
Operator methods for boundary value problems |
Hassi, Seppo; de Snoo Hendrik S.V.; Szafraniec, Franciszek H. |
