Institution: | 1. College of Mathematics and Information Science, Shaanxi Normal University, Xi’an, 710062, People’s Republic of China 2. Department of Mathematics and Physics, Chongqing Jiaotong University, Chongqing, 400074, People’s Republic of China 3. Natural Resources Institute, University of Greenwich at Medway, Central Avenue, Chatham Maritime, Kent, ME4 4TB, UK
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