1. School of Mathematics and Statistics, Central South University, Changsha, Hunan, PR China
2. Department of Basic Science Faculty of Computers & Informatics, Suez Canal University, Ismailia, Egypt
3. School of Business, Central South University, Changsha, PR China
4. Department of Mathematics Faculty of Science. Tanta University, Tanta, Egypt
5. Department of Mathematical Science, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
6. King Khalid University, College of Science, Department of Mathematics, Abha, Saudi Arabia
7. Department of Mathematics, Faculty of Science, Al-Azhar University, Assiut, Egypt