Tarroja-Keller, M.F.H., Palima, D., Natividad, J., Guerrero, R. and Baun, S. 1997. Amplification of light by a drift-type photorefractive crystal. Proceedings of the Samahang Pisika ng Pilipinas, 15(1), SPP-1997-OP-13. URL: https://proceedings.spp-online.org/article/view/SPP-1997-OP-13.