%0 Journal Article
%A Yu. E. Karpeshina
%T The theory of perturbations for a polyharmonic operator with non-smooth periodic potential
%J Zapiski Nauchnykh Seminarov POMI
%D 1988
%P 76-83
%V 169
%U http://geodesic.mathdoc.fr/item/ZNSL_1988_169_a8/
%G ru
%F ZNSL_1988_169_a8