1. School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen, People's Republic of China
2. Department of Mathematics, University of Swabi, Khyber Pakhtunkhwa, Pakistan
3. Department of Basic Sciences, University of Engineering and Technology Peshawar, Peshawar, Pakistan
4. Department of Mathematics and Statistics, Macquarie University, Sydney, Australia
5. Department of Mathematics, FATA University, Darra Adam Khel, Pakistan
6. Department of Basic Sciences, CECOS University of IT and Emerging Sciences Peshawar, Peshawar, Pakistan