1. Department of Mathematics, Quaid-i-Azam University, Islamabad, Pakistan
2. School of Mathematics and Statistics, Beijing Institute of Technology, Beijing 100081, P. R. China
3. Department of Mathematics, Mohi-Ud-Din Islamic University Nerian Sharif, AJK, Pakistan
4. NUTECH School of Applied Sciences and Humanities, National University of Technology, Islamabad 44000, Pakistan
5. Department of Mathematics and Statistics, Hazara University Mansehra, Dhodial, Mansehra, Khyber Pakhtunkhwa 21120, Pakistan
6. Department of Mathematics, College of Sciences, King Khalid University, Abha 61413, Kingdom of Saudi Arabia