Bui Van, Loat, 		Leuangtakoun, Somsavath, 		Kim Duyen, Vu, AND 		Khang, Khong.
" Natural Radioactivity and External Dose Assessment  of Surface Soils in Bolikhamxay Province, Laos" <em>VNU Journal of Science: Mathematics - Physics</em> [Online], Volume 33 Number 4 (25 December 2017)