1. General Education Department, Anhui Xinhua University, Hefei, P.R. China
2. Department of Mathematics, COMSATS University Islamabad, Lahore Campus, Pakistan
3. Department of Electrical Engineering, College of Engineering, Qassim University, Unaizah, Saudi Arabia
4. Abdus Salam School of Mathematical Sciences, Government College University Lahore, Pakistan
5. College of Chemistry, School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, China