TY  - JOUR
AU  - A. Fraguela Collar
TI  - Perturbation of a polyharmonic operator by a potential of delta-function type
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1981
SP  - 86
EP  - 87
VL  - 15
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1981_15_1_a15/
LA  - ru
ID  - FAA_1981_15_1_a15
ER  -