Lan Phan, K. T.; Chittrakorn, S.; Tai, H. P.; Ruttarattanamongkol, K. Effects of Cooking Methods on the Changes of Total Anthocyanins, Phenolics Content and Physical Characteristics of Purple-Fleshed Sweet Potato (Ipomoea Batatas L.) Grown in Vietnam. Int. J. Adv. Sci. Eng. Inf. Technol. 2018, 8, 227-233.