Han, Le Nguyen Gia, Le Thi Minh Hanh, Huynh Huu Huy, Phan Thi Ngoc Hoa, Nguyen Khoa Hien, and Duong Tuan Quang. 2018. “Research on Production of Some Natural Food Colorings”. Hue University Journal of Science: Natural Science 127 (1D):23-36. https://doi.org/10.26459/hueuni-jns.v127i1D.5042.