%0 Journal Article
%A A. P. Sadovskii
%T Solution of the problem of the center and focus for a Li\'enard system with polynomial coefficients
%J Differencialʹnye uravneniâ
%D 1975
%P 2102-2104
%V 11
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1975_11_11_a23/
%G ru
%F DE_1975_11_11_a23