Longjas, A., Batac, R., Juanico, D.E. and Monterola, C. 2008. Observation of self-organized criticality in a miniature granular mound. Proceedings of the Samahang Pisika ng Pilipinas, 26(1), SPP-2008-5C-04. URL: https://proceedings.spp-online.org/article/view/SPP-2008-5C-04.