%0 Journal Article
%A È. B. Lebedeva
%A S. N. Shimanov
%T On the theory of linear equations with periodic coefficients, close to constants, and with lag
%J Differencialʹnye uravneniâ
%D 1968
%P 1598-1607
%V 4
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1968_4_9_a4/
%G ru
%F DE_1968_4_9_a4