Zuraida Z, Sulistiyani S, Sajuthi D, H. Suparto I. Flavonoids Analysis Using HPLC of Ethanol and Chloroform Fractions of Alstonia Scholaris (R. Br) Bark and Their Antioxidant Potency. IJSBAR. 2017;36(4):16-27. Accessed October 10, 2025. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/8082