TY  - JOUR
AU  - Konrad Schmüdgen
TI  - Perturbations of Selfadjoint Operators with Point Spectra by Restrictions and Selfadjoint Extensions.
JO  - Mathematische Annalen
PY  - 1981
SP  - 233
EP  - 248
VL  - 256
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1981__256_163508/
ID  - MAN_1981__256_163508
ER  -