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Author(s): Chun-Jie Li*, Yan-Cong Cheng, Hui-Ru Zhao School of Economics and Management, North China Electric Power University, Beijing, 102206, China International Journal of Smart Grid and Clean Energy, vol. 1, no. 1, September 2012: pp. 29–32 ISSN: 2315-4462 Digital Object Identifier: 10.12720/sgce.1.1.29-32