%0 Journal Article
%A Yu. I. Zubko
%A V. A. Tyshkevich
%T On the question of the positivity of a Cauchy function
%J Differencialʹnye uravneniâ
%D 1973
%P 1207-1213
%V 9
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1973_9_7_a4/
%G ru
%F DE_1973_9_7_a4