Electronic Journal of Differential Equations,
Vol. 2011 (2011), No. 49, pp. 1-11.

Title: Multiple positive periodic solutions to a non-autonomous 
       Lotka-Volterra predator-prey system with harvesting terms
       
Authors: Kaihong Zhao (Kunming Univ. of Science and Tech., Yunnan, China)
         Yongkun Li   (Yunnan Univ. Yunnan, China)

Abstract:
 Using Mawhin's continuation theorem of coincidence degree
 theory, we establish the existence  of $2^{n+m}$ positive 
 periodic solutions for a  non-autonomous Lotka-Volterra 
 network-like predator-prey  system with harvesting terms. 
 Here n and m denote the number of prey and predator species 
 respectively. An example is given to illustrate our results.
	 
Submitted November 26, 2010. Published April 07, 2011.
Math Subject Classifications: 34C25, 92D25.
Key Words: Periodic solutions;  Lotka-Volterra network;
    predator-prey system; coincidence  degree; harvesting term.