Cruz, M.T., Lorenzo, G.H. and Simpas, J.B. 2008. Identification of ambient particulate matter source direction using the conditional probability function. Proceedings of the Samahang Pisika ng Pilipinas, 26(1), SPP-2008-1D-05. URL: https://proceedings.spp-online.org/article/view/SPP-2008-1D-05.