H. Azhan, et al. “EFFECT OF Zr ADDITION ON Bi1.6Pb0.4Sr2Ca2Cu3Oδ SUPERCONDUCTOR”. Solid State Science and Technology, vol. 19, no. 1, May 2026, pp. 6-14, https://journal.massmalaysia.org/ojs/index.php/ssst/article/view/627.