| Academic Programs | 
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                Scientific research | 
                Na Zhang, Binxiang Dai, Yuming Chen, Positive periodic solutions of nonautonomous functional differential systems.  Journal of Mathematical Analysis and Applications ,333(2):667-678,2007.             Na Zhang, Binxang Dai, Xiangzheng Qian,  Periodic solutions for a class of higher-dimension functional differential equations with impulses.  Nonlinear Analysis: Theory, Methods & Applications , 68(3):629-638,2008.   |