Electronic Journal of Differential Equations,
Vol. 2009(2009), No. 17, pp. 1-12.

Title: Periodic solutions of non-autonomous second order systems
       with p-Laplacian
   
Authors: Zhiyong Wang (Nanjing Normal Univ., Jiangsu, China)
         Jihui Zhang  (Nanjing Normal Univ., Jiangsu, China)

Abstract:
 We prove the existence of periodic solutions for
 non-autonomous second order systems with p-Laplacian.
 Our main tools are the minimax methods in critical point theory.
 Our results are new, even when p=2.
 
Submitted August 26, 2008. Published January 20, 2009.
Math Subject Classifications: 34B15, 47J30, 58E05.
Key Words: Periodic solutions; Hamiltonian system; p-Laplacian