Cheng Chua, K.U. and Lorenzo, G.H. 2005. PM2.5 source identification through a modified potential source contribution function (PSCF). Proceedings of the Samahang Pisika ng Pilipinas, 23(1), SPP-2005-PB-27. URL: https://proceedings.spp-online.org/article/view/SPP-2005-PB-27.