Sedky, A., Amna Salah, and S. A. Amin. “Excess Conductivity and Critical Physical Parameters of Y Substituted Ca Site of Bi: 2223 High Tc Superconductors”. Asian Journal of Physical and Chemical Sciences 3, no. 2 (October 11, 2017): 1-15. Accessed August 14, 2020. https://journalajopacs.com/index.php/AJOPACS/article/view/22690.