%0 Journal Article
%A I. N. Astafieva
%T Second solutions of equations with positive operators
%J Differencialʹnye uravneniâ
%D 1970
%P 1722-1724
%V 6
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1970_6_9_a21/
%G ru
%F DE_1970_6_9_a21