Thongley, Thongley, and Chaiwiwat Vansarochana. “Landslide susceptibility assessment using frequency ratio model at Ossey watershed area in Bhutan”. Engineering and Applied Science Research 48, no. 1 (January 27, 2021): 56–64. accessed September 18, 2026. https://ph01.tci-thaijo.org/index.php/easr/article/view/240477.