SATRIA, R.; HAKIM, A. R.; DARSONO, P. V. Determination of Total Flavonoid Content of the n-Hexane Fraction of Gelinggang Leaf Extract by UV-Vis Spectrophotometric Method. Journal of Engineering, Technology, and Applied Science (JETAS), v. 4, n. 1, p. 33-46, 24 Apr. 2022.