1. Department of Mathematics, Faculty of Science, Zagazig University, Egypt
2. Department of Mathematics, College of Science and Arts, Qassim University, Al Mithnab, Saudi Arabia
3. Department of Mathematics, College of Science, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
4. Basic and Applied Scientific Research Center, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
5. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, P.R. China