To, Hien, Nguyen Nguyen, and Huy Duong. “Construction a Process to Measurement the Indoor Radon Concentration”. Science and Technology Development Journal 16, no. 3 (September 30, 2013): 53-60. Accessed November 23, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1619.