%0 Journal Article
%A A. E. Rudenok
%T Strong isochrony of the center. Periods of limit cycles of the Lienard system
%J Differencialʹnye uravneniâ
%D 1975
%P 811-819
%V 11
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1975_11_5_a4/
%G ru
%F DE_1975_11_5_a4