Le , Dang Khoa, and Minh Hao Hoang. “Triterpenoids Isolated from Helicteres Hirsuta”. Journal of Technical Education Science 15, no. 1 (February 26, 2020): 12–16. Accessed April 7, 2026. https://www.jte.edu.vn/index.php/jte/article/view/170.