1. School of Mathematics and Computational Science, Anqing Normal University, Anqing 246011, China
2. School of Mathematics, Southeast University, Nanjing 210096, China
3. Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
4. Department of Electrical and Computer Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia