%0 Journal Article
%A V. V. Amel'kin
%A V. È. Zhavnerchik
%T Periodic solutions of certain second order equations
%J Differencialʹnye uravneniâ
%D 1976
%P 1147-1150
%V 12
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1976_12_7_a0/
%G ru
%F DE_1976_12_7_a0