Batac, R.C., Pastor, M.G. and Monterola, C.P. 2008. Kinks and logarithmic tails as stability markers in binary granular piles. Proceedings of the Samahang Pisika ng Pilipinas, 26(1), SPP-2008-2C-01. URL: https://proceedings.spp-online.org/article/view/SPP-2008-2C-01.