TY  - JOUR
AU  - T. A. Suslina
TI  - Descrete spectrum of the two-dimensional periodic second order elliptic operator perturbed by a~decaying potential. II.~Internal gaps
JO  - Algebra i analiz
PY  - 2003
SP  - 128
EP  - 189
VL  - 15
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AA_2003_15_2_a2/
LA  - ru
ID  - AA_2003_15_2_a2
ER  -