Electronic Journal of Differential Equations,
Vol. 2012 (2012), No. 77, pp. 1-8.

Title: Existence of periodic solutions for Rayleigh equations with
       state-dependent delay 

Authors: Jehad  O. Alzabut (Prince Sultan Univ., Riyadh, Saudi Arabia)
         Cemil Tunc (Yuzuncu Yil Univ., Van, Turkey)

Abstract:
 We establish sufficient conditions for the existence of
 periodic solutions for a  Rayleigh-type equation with
 state-dependent delay. Our approach is based on the continuation
 theorem in degree theory, and some analysis techniques. An 
 example illustrates that our approach to this problem is new.

Submitted December 22, 2011. Published May 14, 2012.
Math Subject Classifications: 34K13.
Key Words: Rayleigh Equation; continuation theorem; periodic solutions.