Poosiri, S. ., S. . Thongseenuch, S. . Saisom, and N. . Chanmanee. “The Invention of Natural Rubber Mixed With High Loading Bismuth for Radiation Protection in Diagnostic Radiology”. The Thai Journal of Radiological Technology, vol. 44, no. 1, Dec. 2019, pp. 8-14, https://he02.tci-thaijo.org/index.php/tjrt/article/view/246753.