Phan, Anh, and Nhan Le. “Investigation of Stability of Colorant Powders Extracting from Japanese Purple Sweet Potato (Ipomoea Batatas (L.) Poir)”. Science and Technology Development Journal 20, no. K7 (November 27, 2018): 28-34. Accessed July 22, 2024. https://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/1208.