1. School of Mathematics and Statistics, Beijing Institute of Technology, Beijing, 100081, P. R. China
2. Department of Mathematics, Huzhou University, Huzhou 313000, P. R. China
3. Hunan Provincial Key Laboratory of Mathematical Modelling and Analysis in Engineering, Changsha University of Science & Technology, Changsha 410114, P. R. China
4. Department of Mathematical Sciences, Baluchistan University of Information Technology, Engineering and Management Sciences, Quetta 87300, Pakistan
5. Department of Mathematics and Statistics, Hazara University Mansehra, KPK, Pakistan
6. Department of GNSS, Institute of Space Technology, Islamabad, Pakistan