Villagonzalo, D.I., Orosco, E.A. and Zuidberg, B.F.J. 2003. Design and acoustic performance of a photoacoustic cell for use in an air pollution monitoring system in Metro Cebu. Proceedings of the Samahang Pisika ng Pilipinas, 21(1), SPP-2003-3A-02. URL: https://proceedings.spp-online.org/article/view/SPP-2003-3A-02.