Zhijun Zeng, Li Zhai
Abstract: Submitted December 2, 2006. Published December 3, 2007.
Math Subject Classifications: 34K45, 34K13, 92D25.
Key Words: Ratio-dependent predator-prey system;
periodic solutions; coincidence degree.
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Zhijun Zeng Institute of Systems Science Academy of Mathematics and Systems Sciences Chinese Academy of Sciences, Beijing 100080, China email: zthzzj@amss.ac.cn |
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Li Zhai School of Mathematics and Statistics Southwest University, Chongqing 400715, China email: zl6168@swu.edu.cn |
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