TY  - JOUR
AU  - A. Fraguela Collar
TI  - On perturbation of a polyharmonic operator by delta-like potentials
JO  - Sbornik. Mathematics
PY  - 1987
SP  - 389
EP  - 396
VL  - 58
IS  - 2
UR  - http://geodesic.mathdoc.fr/item/SM_1987_58_2_a4/
LA  - en
ID  - SM_1987_58_2_a4
ER  -