Prawatvatchara, W., T. Sriamporn, A. Klaisiri, and N. Thamrongananskul. “Radiopacity of 9 Clear Resin Cements and Zinc Phosphate Cement”. Khon Kaen University Dental Journal, vol. 24, no. 1, Mar. 2021, pp. 41-51, https://he01.tci-thaijo.org/index.php/KDJ/article/view/240917.