1. School of Mathematics and Computer Sciences, Chifeng University, Chifeng 024000, China
2. Department of Mathematics, Abbottabad University of Science and Technology, Abbottabad 22500, Pakistan
3. Mathematics Department, College of Science, King Saud University, P.O. Box 22452, Riyadh 11495, Saudi Arabia
4. Institute of Numerical Sciences, Kohat University of Sciences and Technology, Kohat 26000, Pakistan