\bibitem{1} S. M. Chen, {\it Forecasting enrollments based on fuzzy time series}, Fuzzy Sets and Systems, {\bf 81}\textbf{(3)}(1996), 311--319.
\bibitem{2} T. L. Chen, C. H. Cheng and H. J. Teoh, {\it High-order fuzzy time-series based on multi-period adaptation model for forecasting stock markets}, Physica A, {\bf 387}\textbf{(4)} (2008), 876--888.
\bibitem{3} C. H. Cheng, T. L. Chen, H. J. Teoh and C. H. Chiang, {\it Fuzzy time-series based on adaptive expectation model for TAIEX forecasting}, Expert System with Applications, {\bf 34}\textbf{(2)} (2008), 1126--1132.
\bibitem{4} C. H. Cheng, G. W. Cheng and J. W. Wang, {\it Multi-attribute fuzzy time series method based on fuzzy clustering}, Expert Systems with Applications, {\bf 34}\textbf{(2)} (2008), 1235--1242.
\bibitem{5} K. H. Huarng, {\it Effective lengths of intervals to improve forecasting in fuzzy time series}, Fuzzy Sets and Systems, {\bf 123}\textbf{(3)} (2001), 387--394.
\bibitem{6} K. Huarng and T. H. K. Yu, {\it The application of neural networks to forecast fuzzy time series}, Physica A, {\bf 336}\textbf{(2)} (2006), 481--491.
\bibitem{7} M. Khashei, M. Bijari and S. R. Hejazi, {\it An extended fuzzy artificial neural networks model for time series forecasting}, Iranian Journal of Fuzzy Systems, {\bf 8}\textbf{(3)} (2011), 45--66.
\bibitem{8} I. H. Kuo, S. J. Horng, T. W. Kao, T. L. Lin, C. L. Lee and Y. Pan, {\it An improved method for forecasting enrollments based on fuzzy time series and particle swarm optimization}, Expert Systems with Applications, {\bf 36}\textbf{(3)} (2009), 6108--6117.
\bibitem{9} I. H. Kuo, S. J. Horng, Y. H. Chen, R. S. Run, T. W. Kao, R. J. Chen, J. L. Lai and T. L. Lin, {\it Forecasting TAIFEX based on fuzzy time series and particle swarm optimization}, Expert Systems with Applications, {\bf 37}\textbf{(2)} (2010), 1494--1502.
\bibitem{10} L. W. Lee, L. H. Wang and S. M. Chen, {\it Temperature prediction and TAIFEX forecasting based on fuzzy logical relationships and genetic algorithms}, Expert Systems with Applications, {\bf 33}\textbf{(3)} (2007), 539--550.
\bibitem{11} Y. H. Lin and P. C. Lee, {\it Novel high-precision grey forecasting model}, Automation in Contruction, \textbf{16}\textbf{(6)} (2007), 771--777.
\bibitem{12} B. Moller and U. Reuter, {\it Prediction of uncertain structural responses using fuzzy time series}, Computers and Structures, {\bf 86}\textbf{(10)} (2008), 1123--1139.
\bibitem{13} S. R. Singh, {\it A robust method of forecasting based on fuzzy time series}, Applied Mathematics and Computation, {\bf 188}\textbf{(1)} (2007), 472-484.
\bibitem{14} Q. Song and B. S. Chissom, {\it Forecasting enrollments with fuzzy time series --- part I}, Fuzzy Sets and Systems, {\bf 54}\textbf{(1)} (1993), 1--9.
\bibitem{15} Q. Song and B. S. Chissom, {\it Fuzzy time series and its models}, Fuzzy Sets and Systems, {\bf 54}\textbf{(3)} (1993), 269--277.
\bibitem{16} Q. Song and B. S. Chissom, {\it Forecasting enrollments with fuzzy time series --- part II}, Fuzzy Sets and Systems, {\bf 62}\textbf{(1)} (1994), 1--8.
%\bibitem{17} R. C. Tsaur, J. C. O. Yang and H. F. Wang, {\it Fuzzy relation analysis in fuzzy time series model}, Computers and Mathematics with Application, {\bf 49}\textbf{(4)}(2005), 539--548.
\bibitem{18} C. H. Wang, {\it Predicting tourism demand using fuzzy time series and hybrid grey theory}, Tourism Management, {\bf 25}\textbf{(3)} (2004), 367--374.
\bibitem{19} N. Y. Wang and S. M. Chen, {\it Temperature prediction and TAIFEX forecasting based on automatic clustering techniques and two-factor high-order fuzzy time series}, Expert Systems with Applications, {\bf 36}\textbf{(2)} (2007), 2143--2154.
\bibitem{20} H. L. Wong, Y. H. Tu and C. C. Wang, {\it Application of fuzzy time series models for forecasting the amount of Taiwan export}, Expert Systems with Applications, {\bf 37}\textbf{(2)} (2010), 1465--1470.
\bibitem{21} H. K. Yu, {\it Weighted fuzzy time series model for TAIEX forecasting}, Physica A, {\bf 349}\textbf{(3-4)} (2005), 609--624.
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