1. Department of Mathematics, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia
2. Department of Mathematics, Faculty of Science, AL-Azhar University, Assiut, Egypt
3. Department of Mathematics, COMSATS University Islamabad, Islamabad, Pakistan
4. Department of Mathematics, Abdul Wali Khan University, Mardan, Pakistan
5. Department of Mathematics, Kabul Polytechnic University, Kabul, Afghanistan