1. Department of Mathematics, Shanghai Normal University, Shanghai 200234, P. R. China
2. Center for Applied Mathematics of Guangxi, and Guangxi Colleges and Universities Key Laboratory of Complex, System Optimization and Big Data Processing, Yulin Normal University, Yulin 537000, P. R. China
3. Department of Mathematics, FPT University, Education zone, Hoa Lac High Tech Park, Km29 Thang Long highway, Thach That ward, Hanoi, Vietnam
4. Center for General Education, China Medical University, Taichung, Taiwan, ROC
5. Academy of Romanian Scientists, 50044, Bucharest, Romania