L. A. . Damarhati, M. R. Fajriansyah, Anyalirria, R. P. . Putra, N. Liwanda, and W. Nurcholis, “Optimization of Extraction Solvent for Analysis of Total Phenolic and Antioxidant Activity of Guava Leaves (Psidium guajava) using Simplex Centroid Design”, J Jamu Indo, vol. 8, no. 3, pp. 90–96, Dec. 2023.