1. School of Mathematical Sciences, Zhejiang Normal University, 688 Yingbin Road, Jinhua, Zhejiang 321004, P. R. China
2. Department of Mathematics, University of Rajasthan, Jaipur 302004, Rajasthan, India
3. Department of Computer Science and Mathematics, Lebanese American University, Beirut, Lebanon
4. Department of Mathematics, Art and Science Faculty, Siirt University, 56100 Siirt, Turkey
5. Department of Computer Science, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
6. Faculty of Computing and Information Technology, King Abdulaziz University, Jeddah 21589, Saudi Arabia