?:authorAffiliation
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[\'School of Science, Chang\'an University, Xi\'an 710064, PR China.\', \'College of Mathematics and Information Science, Shaanxi Normal University, Xi\'an 710062, PR China.\', \'College of Mathematics and Information Science, Shaanxi Normal University, Xi\'an 710062, PR China. Electronic address: sytang@snnu.edu.cn.\']
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