1. Department of Mathematics, University of Malakand, Chakdara, Dir(Lower), Khyber Pakhtunkhwa, Pakistan
2. Department of Mathematics, College of Arts and Science, Prince Sattam bin Abdulaziz University, Wadi Aldawaser 11991, Saudi Arabia
3. Department of Physics, College of Sciences, University of Bisha, P. O. Box 344, Bisha 61922, Saudi Arabia
4. Physics Department, Faculty of Science, Al-Azhar University, Assiut 71524, Egypt
5. Department of Mathematics, College of Science, King Khalid University, P. O. Box 9004, 61413 Abha, Saudi Arabia
6. Department of Mathematics, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt