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Kwangho Cha and  Hyeyoung Cho and  Sungho Kim,  Performance Analysis of the Subgroup Method for Collective I/O.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2007, vol. 8(8). 2338 - 2341[viewed 19 November 2017]. Available from: http://waset.org/publications/1854.