%0 Journal Article
%A I. M. Sobol'
%T Positive solutions of linear differential equations with retardation
%J Uchenye Zapiski Moskovskogo Gosudarstvennogo Universiteta
%D 1956
%P 45-56
%V 181
%N 181
%I mathdoc
%U http://geodesic.mathdoc.fr/item/UZMU_1956_181_181_a2/
%G ru
%F UZMU_1956_181_181_a2