Electronic Journal of Differential Equations,
Vol. 2009(2009), No. 140, pp. 1-12.

Title: Periodic solutions for a Lienard equation
       with two deviating arguments

Authors: Yong Wang (Southwest Petroleum Univ., Chengdu, China)
         Junkang Tian (Southwest Petroleum Univ., Chengdu, China)

Abstract: 
 In this work, we prove the existence and uniqueness of periodic
 solutions for a Lienard equation with two deviating arguments.
 Our main tools are the Mawhin's continuation theorem and
 the Schwarz inequality. We obtain our results under weaker
 conditions than those in [14],  as shown by an example in
 the last section of this artticle.

Submitted July 7, 2009. Published October 30, 2009.
Math Subject Classifications: 34C25, 34D40.
Key Words: Periodic solution; Lienard equation; deviating argument.