TY  - JOUR
A1  - Jonas, Peter
A1  - Langer, Heinz
T1  - Selfadjoint extensions of a closed linear relation of defect one in a Krein space
Y1  - 1993
ER  - 
TY  - JOUR
A1  - Jonas, Peter
T1  - Operator representations of definitizable functions
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Jonas, Peter
T1  - On the trace formula of perturbation theory
Y1  - 1999
ER  -