TY  - JOUR
AU  - D. I. Borisov
TI  - On the spectrum of a~two-dimensional periodic operator with a~small localized perturbation
JO  - Izvestiya. Mathematics 
PY  - 2011
SP  - 471
EP  - 505
VL  - 75
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_2011_75_3_a1/
LA  - en
ID  - IM2_2011_75_3_a1
ER  -