1. School of Mathematics and Statistics, Central South University, Changsha, Hunan, P. R. China
2. Department of Mechanical Engineering, College of Engineering in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia
3. Centre for Energy Research and Training, Ahmadu Bello University, Zaria, Nigeria
4. Department of Mathematics and Statistics, College of Science, Taif University, Taif, Saudi Arabia
5. Department of Mathematics, Adham University College, Umm Al-Qura University, Adham, Makkah, Saudi Arabia
6. Department of Basic Sciences, Faculty of Computers and Informatics, Suez Canal University, Ismailia, Egypt