1. M. K. Rajput:
Department of Phys, Govt. College Hyderabad, Sindh, Pakistan
2. S. A. Khan:
Department of Phys, Govt. College Hyderabad, Sindh, Pakistan
3. Naseeruddin:
Department of Phys, University Karachi, Karachi, Pakistan
4. Z. A. Zaidi:
Department of Phys, Govt. College Sci. Multan, Pakistan