Bui Van, Loat, Somsavath Leuangtakoun, Vu Thi Kim Duyen, & Khong Nam Khang.
" Natural Radioactivity and External Dose Assessment  of Surface Soils in Bolikhamxay Province, Laos." <em>VNU Journal of Science: Mathematics - Physics</em> [Online], 33.4 (2017): n. pag. Web. 22 Dec. 2024