คำนวณทิพย์ ฉ. Radon Gas in Buildings and Construction Materials. Frontiers in Engineering Innovation Research, [S. l.], v. 7, p. 1–11, 2009. Disponível em: https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242184. Acesso em: 2 sep. 2026.