%0 Journal Article %T Hopf Bifurcation of Limit Cycles in Discontinuous Li¨Śnard Systems %A Yanqin Xiong %A Maoan Han %J Abstract and Applied Analysis %D 2012 %I Hindawi Publishing Corporation %R 10.1155/2012/690453 %X We consider a class of discontinuous Liénard systems and study the number of limit cycles bifurcated from the origin when parameters vary. We establish a method of studying cyclicity of the system at the origin. As an application, we discuss some discontinuous Liénard systems of special form and study the cyclicity near the origin. %U http://www.hindawi.com/journals/aaa/2012/690453/