Bui Van, L., 		Leuangtakoun, S., 		Kim Duyen, V., & 		Khang, K.
(2017).
 Natural Radioactivity and External Dose Assessment  of Surface Soils in Bolikhamxay Province, Laos.
<em>VNU Journal Of Science: Mathematics - Physics, 33</em>(4).
doi:10.25073/2588-1124/vnumap.4224