TY  - JOUR
AU  - A. S. Andreev
TI  - Estimates of the spectrum of compact pseudodifferential operators in unbounded domains
JO  - Sbornik. Mathematics
PY  - 1991
SP  - 431
EP  - 443
VL  - 70
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1991_70_2_a6/
LA  - en
ID  - SM_1991_70_2_a6
ER  -