Positive periodic solutions of delayed Nicholson’s blowflies models with a nonlinear density-dependent mortality term☆
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Keywords
Nicholson’s blowflies
Positive periodic solutions
Coincidence degree
Nonlinear density-dependent mortality term
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This work was supported by the Natural Scientific Research Fund of Zhejiang Provincial of PR China (Grant No. Y6110436), and the Natural Scientific Research Fund of Zhejiang Provincial Education Department of PR China (Grant No. Z201122436).
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