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Larbi Omar and  Elberrichi Zakaria,  Clustering Methods Applied to the Tracking of user Traces Interacting with an e-Learning System.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 1015 - 1019[viewed 20 March 2018]. Available from: http://waset.org/publications/15037.