| 2013 |
Linear fractional transformations of Nevanlinna functions associated with a nonnegative operator |
Behrndt, Jussi; Hassi, Seppo; de Snoo, Henk; Wietsma, Rudi; Winkler, Henrik |
| 2013 |
On J-self-adjoint operators with stable C-symmetries |
Hassi, Seppo; Kuzhel, Sergii |
| 2012 |
Operator methods for boundary value problems |
Hassi, Seppo; de Snoo Hendrik S.V.; Szafraniec, Franciszek H. |
| 2012 |
On Calkin's abstract symmetric boundary conditions |
Hassi, Seppo; Wietsma, Hendrik Luit |
| 2012 |
Dirac structures and boundary relations |
Hassi, Seppo; van der Schaft, Arjan J; de Snoo, Hendrik S.V.; Zwart, Hans J. |
