Palakawong na Ayudhya, C., S. Luengpailin, and V. Lulitanond. “Antimicrobial Efficiency of Mutacin 1140 Extract on Oral Streptococci”. Khon Kaen University Dental Journal, vol. 20, no. 2, Feb. 2018, pp. 1-10, https://he01.tci-thaijo.org/index.php/KDJ/article/view/112168.