TY  - JOUR
AU  - Andrzej Pokrzywa
TI  - Perturbation of the spectrum οf an essentially selfadjoint operator
JO  - Applicationes Mathematicae
PY  - 1993
SP  - 75
EP  - 89
VL  - 22
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/am-22-1-75-89/
DO  - 10.4064/am-22-1-75-89
LA  - en
ID  - 10_4064_am_22_1_75_89
ER  -