Nguyen Quang Hoan, Pham Ngoc Hung, and Nguyen Dinh Tai. “HANDWRITTING CHARACTER RECOGNITION USING CONVOLUTIONAL NEURAL NETWORKS”. UTEHY Journal of Applied Science and Technology, Vol. 24, Jan. 2020, pp. 60-65, http://tapchi.utehy.edu.vn/index.php/jst/article/view/325.