ปฏิมานุเกษม พ., and ปัญญางาม ย. “Erosion of synthetic apatite by citric acid added beverages available in Thailand”. Thai Dental Public Health Journal, vol. 15, no. 1, June 2010, pp. 28-36, https://he02.tci-thaijo.org/index.php/ThDPHJo/article/view/178749.