1. Department of Basic Science, Faculty of Engineering at Benha, Benha University, Benha, Egypt
2. Department of Mathematics, College of Sciences and Human Studies at Howtat Sudair, Majmaah University, Majmaah, Saudi Arabia
3. Department of Mathematics, Zhejiang Normal University, Jinhua, Zhejiang, People’s Republic of China
4. Department of Mathematics, King Abdulaziz University, Jeddah, Saudi Arabia
5. Department of Mathematics and Statistics, University of South Florida, Tampa, FL, USA
6. School of Mathematical and Statistical Sciences, North-West University, Mmabatho, South Africa