1. School of Mathematics, Southeast University, Nanjing 210096, China
2. College of Mathematics and Computer Science, Zhejiang Normal University, Jinhua 321004, China
3. Institute of Computational Intelligence, Czestochowa University of Technology, Czestochowa 42-200, Poland
4. Information Technology Institute, University of Social Sciences, Łódź 90-113, Poland
Corresponding author: Jin-de CAO
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