1. School of Physical Science and Technology
2. Southwest University
3. Chongqing 400715
4. P. R. China
5. Institute for Superconducting and Electronic Materials
6. University of Wollongong
7. Wollongong 2500
8. Australia
9. Laboratoire de Physique Quantique
10. de la Matière et de la Modélisation Mathématique (LPQ3M)
11. Université de Mascara
12. Mascara 29000
13. Algeria