%0 Journal Article
%A S. A. Nazarov
%T Breakdown of cycles and the possibility of opening spectral gaps

%J Izvestiya. Mathematics 
%D 2018
%P 1148-1195
%V 82
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_2018_82_6_a3/
%G en
%F IM2_2018_82_6_a3