%0 Journal Article
%A B. M. Levitan
%T Asymptotic behaviour of the spectral function of an elliptic equat
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1971
%P 165-232
%V 26
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1971_26_6_a4/
%G en
%F RM_1971_26_6_a4