TY  - JOUR
AU  - M. Sh. Birman
TI  - The discrete spectrum in gaps of the perturbed periodic Schr\"odinger operator.~II. Nonregular perturbations
JO  - Algebra i analiz
PY  - 1997
SP  - 62
EP  - 89
VL  - 9
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AA_1997_9_6_a2/
LA  - ru
ID  - AA_1997_9_6_a2
ER  -