1. Department of Defense Science, Faculty of Defense Science and Technology, Universiti Pertahanan Nasional Malaysia, Kem Sungai Besi, Kuala Lumpur 57000, Malaysia
2. Department of Mathematics, Centre for Defence Foundation Studies, Universiti Pertahanan Nasional Malaysia, Kem Sungai Besi, Kuala Lumpur 57000, Malaysia
3. Department of Mathematics, Capital University of Science and Technology (CUST), Islamabad 44000, Pakistan
4. Department of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (UKM), Bangi 43600, Malaysia
5. Department of Mathematics, Babeş-Bolyai University, 400084 Cluj-Napoca, Romania
6. Department of Mathematics, Faculty of Science, New Valley University, Al-Kharga 72511, Al-Wadi Al-Gadid, Egypt
7. Department of Mathematics, Faculty of Science, Northern Border University, Arar 1321, Saudi Arabia