Luu, Thi Lan Anh, Ngoc Trung Nguyen, Thi Tuyet Mai Nguyen, and Thach Son Vo. 2019. “Study of a Process for the Extraction of a Betacyanin-Based Nature Colouring from Viet Nam Red Dragon”. Old Journal, no. 132 (January):72-75. https://jst.vn/index.php/old/article/view/689.