TY  - JOUR
AU  - M. Sh. Birman
TI  - Average procedure for periodic operators near an edge of internal gap
JO  - Algebra i analiz
PY  - 2003
SP  - 61
EP  - 71
VL  - 15
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AA_2003_15_4_a1/
LA  - ru
ID  - AA_2003_15_4_a1
ER  -