1. National Centre for Physics (NCP), Shahdra Valley Road, Islamabad, Pakistan
2. Theoretical Research Institute Pakistan Academy of Sciences (TRIPAS), 3 Constitution Avenue, G-5/2 Islamabad, Pakistan
3. Department of Space Science, Institute of Space Technology (IST), Islamabad, Pakistan
4. Theoretical Physics Division, PINSTECH, P. O. Box 44000 Nilore, Islamabad, Pakistan