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Positive Periodic Solutions for Delay Multispecies Logarithmic Population Model

LIU Zhijun(Department of Computer Science and Mathematics, Hubei institute for Nationalities, Enshi 445000)  
A multispecies Logarithmic population model with several delays is investigated, with the help of continuation theorem in coincidence degree theory and Lyapunov functional, the existence, asymptotic behavior of the positive periodic solutions are derived, and hence results in some references are extended and improved.
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