%0 Journal Article
%A A. A. Zevin
%T Estimates of periodic solutions of second-order nonlinear differential equations
%J Differencialʹnye uravneniâ
%D 1982
%P 1673-1679
%V 18
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1982_18_10_a2/
%G ru
%F DE_1982_18_10_a2