Electronic Journal of Differential Equations,
Vol. 2004(2004), No. 02, pp. 1-11.

Title: Multiple periodic solutions of a discrete time 
       predator-prey systems with type IV functional responses

Authors: Zhigang Liu (Xiangnan Univ., Chenzhou, China)
         Anping Chen (Xiangnan Univ., Chenzhou, China)
         Jinde Cao   (Southeast Univ., Nanjing, China)
	 Fengde Chen (Fuzhou Univ., Fujian, China)

Abstract: 
  By using the continuation theorem of Mawhin's coincidence 
  degree theory, some sufficient conditions are obtained 
  ensuring the existence of multiple positive periodic 
  solutions of a discrete time predator-prey systems with 
  type IV functional responses.

Submitted September 2, 2003. Published January 2, 2004.
Math Subject Classifications: 39A11, 92B05.
Key Words: Periodic solution; delayed predator-prey; coincidence degree; 
type IV functional response;  non-autonomous difference equation.