Macalalad, E.P., Uy, J.C.Q., Bangsal, E.B., Vallar, E.A. and Galvez, M.C.D. 2005. Initial measurements of atmospheric turbidity parameters using solar spectral irradiance over Manila area. Proceedings of the Samahang Pisika ng Pilipinas, 23(1), SPP-2005-PB-03. URL: https://proceedings.spp-online.org/article/view/SPP-2005-PB-03.