%0 Journal Article
%A Yu. N. Valitskii
%T On the convergence of difference approximations of the eigenvalues and eigenfunctions of a two-dimensional elliptic operator
%J Doklady Akademii Nauk
%D 1971
%P 263-265
%V 198
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_198_2_a0/
%G ru
%F DAN_1971_198_2_a0