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About the article
Published Online: 2016-12-17
Published in Print: 2017-02-01
This work was supported by Tian Yuan Fund of NSFC (No.11526180), Yunnan University of Finance and Economics Scientific Research Found Project (No.YC2015D09), Yunnan Province Education Department Scientific Research Fund Project (No.2015Y275), Natural Science Foundation of Yunnan Province of China under Grant No. 2014FD049 and Natural Science Foundation of Ningxia Province under Grant No. NZ15255.