Manuel, A.H.G., Reyes, M.D. and Sarmago, R.V. 2002. Substitution effects of Fe and Zn on the superconductivity and microstructure of YBa2Cu2O7−δ (YBCO). Proceedings of the Samahang Pisika ng Pilipinas, 20(1), SPP-2002-2D-06. URL: https://proceedings.spp-online.org/article/view/SPP-2002-2D-06.