1. School of Mathematics and Statistics, North China University of Water Resources and Electric Power, Zhengzhou, P.R. China
2. School of Management and Economics, North China University of Water Resources and Electric Power, Zhengzhou, P.R. China
3. College of Economics and Management, Nanjing University of Aeronautics and Astronautics, Nanjing, China
4. Department of Computer Science, University of Education, Lahore, Pakistan
5. Department of Computer Science, University of Engineering and Technology, Lahore, Pakistan