1. School of Mathematics and Computer Sciences, Chifeng University, Chifeng 024000, China
2. Department of Mathematics, Abdul Wali Khan University Mardan, Mardan 23200, Pakistan
3. Department of Mathematics, College of Science, King Saud University, P.O. Box 22452, Riyadh 11495, Saudi Arabia
4. Department of Mathematics, COMSATS University Islamabad, Wah Campus, Wah Cantt 47040, Pakistan