1. Department of Mathematics, Govt College (B), Dhoke Syedan, Rawalpindi, Pakistan
2. Department of Mathematics and Social Sciences, Sukkur IBA University, Sukkur 65200, Sindh, Pakistan
3. Department of Mathematics and Statistics, Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn, Malaysia Batu Pahat 86400, Johar, Malaysia