1. Department of Mathematics, University of Wah, Wah Cantt, Pakistan
2. Department of Mathematics, Huzhou University, Huzhou 313000, China
3. Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering, Changsha University of Science & Technology, Changsha 410114, China
4. Department of Mathematics, COMSATS University Islamabad, Attock Campus, Attock, Pakistan