%0 Journal Article
%A V. I. Borzdyko
%T A topological method for proving the existence of positive periodic solutions for functional-differential equations
%J Differencialʹnye uravneniâ
%D 1990
%P 1671-1678
%V 26
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1990_26_10_a1/
%G ru
%F DE_1990_26_10_a1