Luyen, Le Hong, Dong Thi Thu Hien, and Vu Cam Tu. “Optimization of the Ultrasonic-Assisted Extraction of the Total Methoxyflavones Content from Black Ginger <i>Kaempferia parviflora< i> Rhizomes”. <i>Vietnam Journal of Science and Technology</i> (August 8, 2026). Accessed October 19, 2026. http://vjst.vast.vn/jst/article/view/22178.