1. Department of Mathematics, Shanghai University, No. 99 Shangda Road, Shanghai 200444, China
2. Newtouch Center for Mathematics of Shanghai University, Shanghai 200444, China
3. Department of Computer Engineering, Biruni University, Istanbul, Turkey
4. Department of Computer Science and Mathematics, Lebanese American University, Beirut, Lebanon
5. Department of Mathematics, College of Science, University of Zakho, Zakho 42002, Iraq
6. Department of Computer Science, College of Science, Knowledge University, Erbil 44001, Iraq
7. Department of Mathematics, College of Science, University of Duhok, Duhok 42001, Iraq