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A. I. Dounis and  P. Tiropanis and  D. Tseles and  G. Nikolaou and  G. P. Syrcos,  A Comparison of Grey Model and Fuzzy Predictive Model for Time Series.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. June 2008, vol. 18(6). 2263 - 2268[viewed 20 October 2018]. Available from: http://waset.org/publications/15438.