%0 Journal Article
%A Yu. E. Karpeshina
%T Perturbation theory for the Schr\"odinger operator with periodic potential
%J Informatics and Automation
%D 1990
%P 88-116
%V 188
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TRSPY_1990_188_a4/
%G ru
%F TRSPY_1990_188_a4