%0 Journal Article
%A G. V. Demidenko
%A A. V. Dulepova
%T On periodic solutions of one second-order differential equation
%J Contemporary Mathematics. Fundamental Directions
%D 2021
%P 535-548
%V 67
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMFD_2021_67_3_a8/
%G ru
%F CMFD_2021_67_3_a8