?:authorAffiliation
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[\'School of Mathematics and Statistics, Xi\'an Jiaotong University, Xi\'an 710049, China.\', \'School of Mathematics and Information Science, Shaanxi Normal University, Xi\'an 710119, China.\', \'Natural Resources Institute, University of Greenwich at Medway, Central Avenue, Chatham Maritime, Kent ME4 4B, UK.\', \'Baidu Inc., Beijing 100094, China.\']
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