Arciaga, M., Pastor, M., Batac, R., Bantang, J. and Monterola, C. 2007. Critical angle of a dry binary mixture of granular materials. Proceedings of the Samahang Pisika ng Pilipinas, 25(1), SPP-2007-PR-06. URL: https://proceedings.spp-online.org/article/view/SPP-2007-PR-06.