%0 Journal Article
%A A. G. Terent'ev
%T Certain properties of linear differential operators
%J Differencialʹnye uravneniâ
%D 1969
%P 1635-1641
%V 5
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1969_5_9_a9/
%G ru
%F DE_1969_5_9_a9