Marjoni, M. R., Trijuanda, S. E. . and Evani, N. P. . (2025) “Analysis of tannin and catechin levels in ethyl acetate extract of gambir twigs (Uncaria gambir Roxb.) using UV-Vis spectrophotometry ”, Science Midwifery, 13(3), pp. 735–744. doi: 10.35335/midwifery.v13i3.2013.