Xiang, Z., X. Wu, and X. Zhong. “Ultrasonication Assisted Extraction of Total Flavonoids from Kaempferia Galanga L. And Its Antioxidant Activity”. Bangladesh Journal of Botany, vol. 49, no. 3, Sept. 2020, pp. 601-9, doi:10.3329/bjb.v49i3.49990.