Macalalad, E.P., Uy, J.C.Q., Bangsal, E.B., Vallar, E.A. and Galvez, M.C.D. 2004. Variation of multi-spectral aerosol optical depth (AOD) over Manila. Proceedings of the Samahang Pisika ng Pilipinas, 22(1), SPP-2004-2B-03. URL: https://proceedings.spp-online.org/article/view/SPP-2004-2B-03.