Piñol, C.M.N. and Altoveros, N.C. 2002. Low-cost microcomputer-based instrument for detecting seismic activity using a magnetic vibration sensor. Proceedings of the Samahang Pisika ng Pilipinas, 20(1), SPP-2002-PP-43. URL: https://proceedings.spp-online.org/article/view/SPP-2002-PP-43.