%0 Journal Article
%A V. V. Amel'kin
%A I. V. Gaishun
%A N. N. Ladis
%T Periodic solutions under steadily acting perturbations
%J Differencialʹnye uravneniâ
%D 1975
%P 2115-2120
%V 11
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1975_11_12_a0/
%G ru
%F DE_1975_11_12_a0