Pichetsopon, T., and S. Pailoplee. “DEM and GIS analysis of geomorphic indices for evaluating tectonic activity of Phetchabun province”. Bulletin of Earth Sciences of Thailand, vol. 12, no. 1, Nov. 2021, pp. 1-14, https://ph01.tci-thaijo.org/index.php/bestjournal/article/view/246783.