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Huan Xiong and  Ming Chen,  Towards an AS Level Network Performance Model.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. June 2008, vol. 18(6). 2151 - 2156[viewed 21 October 2017]. Available from: http://waset.org/publications/362.