Kuphasuk, Yosvimol, and Chalermporn Prommas. “The clinical result of subgingivally delivered andrographis paniculata gel versus 10% doxycycline gel in the treatment of supportive periodontal therapy patients”. Mahidol Dental Journal 40, no. 2 (August 26, 2020): 69–76. accessed September 28, 2026. https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/223044.