TY  - JOUR
AU  - A. Fraguela Collar
TI  - On the perturbation of a polyharmonic operator by potentials with small supports
JO  - Doklady Akademii Nauk
PY  - 1979
SP  - 34
EP  - 36
VL  - 245
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1979_245_1_a7/
LA  - ru
ID  - DAN_1979_245_1_a7
ER  -