1. School of Science, Huzhou University, Huzhou, P.R. China
2. Department of Mathematics, Institute of Arts and Sciences, Government College University Faisalabad, Chiniot Campus, Pakistan
3. Department of Mathematical Sciences (FABS), BUITEMS, Quetta, Pakistan
4. Department of Mathematics and Statistics, Riphah International University Islamabad, Islamabad, Pakistan
5. Department of Mathematics, Riphah International University, Faisalabad Campus, Pakistan
6. Department of Mathematics (SSC), University of Management and Technology, Lahore, Punjab, Pakistan