%0 Journal Article
%A S. V. Khryashchev
%T On the discrete spectrum of a perturbed periodic Schr\"odinger operator
%J Zapiski Nauchnykh Seminarov POMI
%D 1991
%P 157-162
%V 190
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ZNSL_1991_190_a7/
%G ru
%F ZNSL_1991_190_a7