Riwu, A. G., Jusak Nugraha, Djoko Agus Purwanto, and Erwin Astha Triyono. “Determination of (+)-Catechin and Antioxidant Activity in Faloak (Sterculia Quadrifida R. Br) Stem Bark Infusion”. Science and Technology Indonesia, vol. 8, no. 1, Jan. 2023, pp. 59-65, doi:10.26554/sti.2023.8.1.59-65.