%0 Journal Article
%A L. A. Cherkas
%A A. A. Grin'
%T Spline approximations in the problem of estimating the number of limit cycles of autonomous systems on the plane
%J Differencialʹnye uravneniâ
%D 2006
%P 213-220
%V 42
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_2006_42_2_a8/
%G ru
%F DE_2006_42_2_a8