1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang, P.R. China
2. Department of Mathematics, University of Sargodha, Pakistan
3. Department of Mathematical Sciences, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
4. Mathematics Department, Faculty of Sciences, Umm Al-Qura University, Makkah, Saudi Arabia
5. Department of Mathematics, Mutah University, Al Karak, Jordan