%0 Journal Article
%A V. Sh. Roitenberg
%T On second-order differential equations on the circle with the rst degree of structural instability
%J Matematičeskie zametki SVFU
%D 2023
%P 40-50
%V 30
%N 1
%U http://geodesic.mathdoc.fr/item/SVFU_2023_30_1_a2/
%G ru
%F SVFU_2023_30_1_a2