1. Department of Physics, University of Education, Lahore, Pakistan
2. Department of Zoology, University of Education, Bank Road, Lahore, Pakistan
3. Department of Physics, University of Management & Technology, Lahore, Pakistan
4. School of Microelectronics, Tianjin University, Tianjin, China
5. Department of Statistics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
6. School of Economics and Management Science, China Three Gorges University, Yichang, China