%0 Journal Article
%A I. V. Gel'man
%T A certain characteristic of normally solvable extensions of a minimal operator
%J Differencialʹnye uravneniâ
%D 1969
%P 2274-2275
%V 5
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1969_5_12_a15/
%G ru
%F DE_1969_5_12_a15