%0 Journal Article
%T One Upper Estimate on the Number of Limit Cycles of Even Degree Li¨Śnard Equations in the Focus Case
%A Grisha Kolutsky
%J Mathematics
%D 2009
%I arXiv
%X We give an explicit upper bound for a number of limit cycles of the Li\'enard equation $\dot{x}=y-F(x)$, $\dot{y}=-x$ of even degree in the case its unique singular point $(0,0)$ is a focus.
%U http://arxiv.org/abs/0911.3516v1