1. Department of Applied Mathematics, School of Science, Northwestern Polytechnical University, Dongxiang Road, Chang’an District, Xi’an 710129, China
2. Department of Mathematics, University of Management and Technology, Lahore 54770, Pakistan
3. Department of Mathematics Govt Postgraduate Gordon College, Rawalpindi, 46000, Pakistan
4. Faculty of Computer Science and Information Technology, Superior University, Lahore 54000, Pakistan