1. Department of Mathematics, University of Swabi, Khyber Pakhtunkhwa, Pakistan
2. Department of Statistics, College of Science, University of Jeddah, Jeddah, Saudi Arabia
3. Department of Civil Engineering, College of Engineering, King Khalid University, Abha, Saudi Arabia + Department of Civil Engineering, High Institute of Technological Studies, Mrezgua University Campus, Nabeul, Tunisia
4. Department of Basic Sciences, University of Engineering and Technology, Peshawar, Pakistan