A. . Arlina, Y. Karim, S. . Chen, S. . Halim, and M. . Awang Kechik, “Synthesis and Effect of Al2O3 Added in Yttrium Barium Copper Oxide YBa2Cu3O? by Solid State Reaction Method”, JTRSS, vol. 4, no. 2, pp. 75–77, Dec. 2016.