1. Department of Mathematics, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, Pakistan
2. School of Mathematical Science, Yangzhou University, Yangzhou, PR China
3. Department of Mathematical Sciences, University of Lakki Marwat, Lakki Marwat, Pakistan
4. Department of Mathematics, University of Swabi, Swabi, Pakistan
5. Department of Mathematics, College of Science, King Saud University, Riyadh, Saudi Arabia