JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2018, Vol. 20 ›› Issue (5): 90-98.doi: 10.19722/j.cnki.1008-7729.2018.0136

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  1. School of Economics, Wuhan University of Technology, Wuhan 430070, China
  • Received:2018-06-05 Online:2018-10-31

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