?:authorAffiliation
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[\'School of Mathematics and Information Science, Shaanxi Normal University, Xi\'an 710062, China.\', \'School of Mathematics and Information Science, Baoji University of Arts and Sciences, Baoji 721013, China.\', \'Natural Resources Institute, University of Greenwich at Medway, Central Avenue, Chatham Maritime, Kent ME4 4TB, UK.\', \'School of Mathematics and Statistics, Xi\'an Jiaotong University, Xi\'an 710049, China.\']
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