N. Yunarto, “Development and Validation of a High-Performance Liquid Chromatography-Based Method for Catechin Isolated from the Leaves of Gambir (Uncaria gambir Roxb): http://www.doi.org/10.26538/tjnpr/v7i3.16”, TJNPR, vol. 7, no. 3, pp. 2569–2573, Apr. 2023, Accessed: Nov. 24, 2024. [Online]. Available: https://tjnpr.org/index.php/home/article/view/1799