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Yilun Shang,  On the Hierarchical Ergodicity Coefficient.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2013, vol. 73(1). 182 - 185[viewed 15 October 2018]. Available from: http://waset.org/publications/9996769.