1. Q. A. Bhatti:
Department of Physics, Shah Abdul Latif University, Khairpur, Pakistan
2. B. A. Malik:
Department of Physics, Shah Abdul Latif University, Khairpur, Pakistan
3. A. H. Bhatti:
Department of Physics, Shah Abdul Latif University, Khairpur, Pakistan
4. A. A. Bhutto:
Department of Physics, Government Degree & Postgraduate College Larkana, Sindh, Pakistan