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x

xi, wenfei, College of Tourism and Geographic Sciences,Yunnan,Normal University,Kunming
Xin, Xiao Long, Department of Mathematics, Northwest University, Xi'an, P.R.China
Xu, Hui, Faculty of Sciences, China University of Mining and Technology, Xuzhou 221008,
XU, Xuecheng, College of Sciences, China University of Mining and Technology, Xuzhou, Jiangsu, 221116,

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