Anit, G.M., Bonifacio, R., Cruz, J.K., Go, A.K., Manapat, J. and Somintac, A. 2012. Hydroxyapatite extraction from bio waste: The influence of porcine bone particle size. Proceedings of the Samahang Pisika ng Pilipinas, 30(1), SPP2012-2A-4. URL: https://proceedings.spp-online.org/article/view/SPP2012-2A-4.