Chen, L., N. Yoshimatsu, Y. Goda, F. Okubo, Y. Taniguchi, M. . Oi, S. Konomi, A. . Shimada, H. . Ogata, and M. Yamada. “Direction of Collaborative Problem Solving-Based STEM Learning by Learning Analytics Approach”. Research and Practice in Technology Enhanced Learning, vol. 14, Dec. 2019, https://rptel.apsce.net/index.php/RPTEL/article/view/2019-14024.