%0 Journal Article
%A S. K. Bloshanskaya
%T On a necessary condition for being a basis
%J Differencialʹnye uravneniâ
%D 1981
%P 778-788
%V 17
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1981_17_5_a1/
%G ru
%F DE_1981_17_5_a1