1. Department of Applied Mathematics, The Hong Kong Polytechnic University, Hong Kong, China
2. School of Mathematical Sciences, Fudan University, Shanghai 200433, China
3. School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou 215009, China
4. Department of Mathematics and Statistics, Murray State University, Murray, KY 42071-0009, USA
Corresponding author: Liqun QI,Yimin WEI,Changqing XU,Tan ZHANG
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