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Changjin Xu and  Peiluan Li,  Periodic Oscillations in a Delay Population Model.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 1181 - 1184[viewed 17 December 2017]. Available from: http://waset.org/publications/576.