Electronic Journal of Differential Equations,
Vol. 2010(2010), No. 34, pp. 1-10.

Title: Positive periodic solutions for nonautonomous impulsive neutral
       functional differential systems with time-varying delays on time scales
       
Authors: Jinchun Dai   (Yunnan Univ., China)
         Yongkun Li    (Yunnan Univ., China)
	 Tianwei Zhang (Yunnan Univ., China)

Abstract:
 Using a fixed point theorem of strict-set-contraction,
 we prove the existence of positive periodic solutions for
 a class of nonautonomous impulsive  neutral functional
 differential system with time-varying
 delays on time scales.

Submitted December 15, 2009. Published March 09, 2010.
Math Subject Classifications: 34K13, 34K40, 34K45.
Key Words: Periodic solution; neutral functional differential systems; 
           time scale; strict-set-contraction