| 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 |
Dirac structures and boundary relations |
Hassi, Seppo; van der Schaft, Arjan J; de Snoo, Hendrik S.V.; Zwart, Hans J. |
| 2012 |
John Williams Calkin: a short biography |
Hassi, Seppo; de Snoo, Hendrik S.V.; Szafraniec, Franciszek H. |
| 2012 |
Boundary triplets and Weyl functions. Recent developments |
Derkach, V.A.; Hassi, Seppo; Malamud, M.M.: de Snoo, Hendrik S.V. |
