TY  - JOUR
AU  - S. A. Nazarov
TI  - Breakdown of cycles and the possibility of opening spectral gaps

JO  - Izvestiya. Mathematics 
PY  - 2018
SP  - 1148
EP  - 1195
VL  - 82
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_2018_82_6_a3/
LA  - en
ID  - IM2_2018_82_6_a3
ER  -