%0 Journal Article
%A Yu. V. Churin
%T Closure of a set of systems with singular periodic solutions
%J Differencialʹnye uravneniâ
%D 1988
%P 999-1004
%V 24
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1988_24_6_a9/
%G ru
%F DE_1988_24_6_a9