Cruzpero, R.C.L., Del Castillo, M.C.A., Licup, A.J.M. and Ceniza, C.R. 2008. Determining the heat capacity ratio of air by sound wave analysis of Helmholtz resonance. Proceedings of the Samahang Pisika ng Pilipinas, 26(1), SPP-2008-3D-05. URL: https://proceedings.spp-online.org/article/view/SPP-2008-3D-05.