Witchathorntrakun, W., S. Wongsanon, and B. Kheonkaew. “Skin Radiation Dose of Patient Undergoing Chest Radiography in Srinagarind Hospital, Faculty of Medicine, Khon Kaen University”. Srinagarind Medical Journal, vol. 25, no. 2, Oct. 2013, pp. 120-4, https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/12861.