%0 Journal Article
%A D. I. Borisov
%T On the spectrum of a~two-dimensional periodic operator with a~small localized perturbation
%J Izvestiya. Mathematics 
%D 2011
%P 471-505
%V 75
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_2011_75_3_a1/
%G en
%F IM2_2011_75_3_a1