Paiden, M.M. and Paiden, A.S. 2009. On the three most frequent source of earthquakes in Luzon from 1973 to 2009. Proceedings of the Samahang Pisika ng Pilipinas, 27(1), SPP-2009-PA-31. URL: https://proceedings.spp-online.org/article/view/SPP-2009-PA-31.