1. Department of Mathematics, Capital University of Science and Technology (CUST), Islamabad, Pakistan
2. Department of Mathematics, Centre for Defence Foundation Studies, Universiti Pertahanan Nasional Malaysia, Kuala Lumpur, Malaysia
3. Chemistry Department, College of Science, King Khalid University, Abha, Saudi Arabia
4. Department of Mathematics, Prince Sattam bin Abdulaziz University, Wadi Aldawaser, Saudi Arabia
5. Department of Mathematics, Faculty of Science, New Valley University, Al-Wadi Al-Gadid, Egypt
6. Department of Mathematics, Faculty of Science, Northern Border University, Arar, Saudi Arabia