T. K. Sari, E. Fithriana, I. . Dewata, D. Kurniawati, and R. D. Y. Away, “The Extracted Pectin from Ambarella Fruit Peel (Spondias dulcis) as Biosorbent in Adsorption of Cu(II) Metal Ions”, J.Ris.Kim., vol. 14, no. 2, pp. 188–197, Oct. 2023.