P. Sitorus, P. A. Hasibuan, and D. Satria, “TOTAL PHENOLIC AND FLAVONOID CONTENTS AND ANTIOXIDANT ACTIVITY OF ETHANOL FRACTION OF PICRIA FEL-TERRAE (LOUR.) HERBS”, Asian J Pharm Clin Res, vol. 10, no. 7, pp. 243–245, Jul. 2017.