Sari, R. et al. 2020. The effect of polymer amount on physical characteristics and in vitro release of diterpene lactone fraction of sambiloto-chitosan nanoparticles. Jurnal Sains Farmasi & Klinis. 7, 2 (Aug. 2020), 99–106. DOI:https://doi.org/10.25077/jsfk.7.2.99-106.2020.