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Kaihong Zhao,  Existence of Multiple Positive Periodic Solutions to n Species Nonautonomous Lotka-Volterra Cooperative Systems with Harvesting Terms.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 819 - 824[viewed 22 October 2017]. Available from: http://waset.org/publications/12665.