1. Sugimura, A., Ozaki, M., Takeoka, S., Adachi, Y.: The effective use of the Web teaching materials in class. The Institute of Electronics, Information and Communication Engineers (IEICE) Technical report, ET, vol. 108(470), pp. 7–12 (2009). (in Japanese)
2. Suzuki, Y.: The effects of seamless combining digital textbooks and e-Learning. J. Educ. Appl. Inf. Commun. Technol. 14(1), 31–35 (2011). (in Japanese) Japan Universities Association for Computer Education
3. Umezawa, K., Ishida, T., Kobayashi, M., Hirasawa, S.: Effectiveness evaluation of practical use of the electronic teaching materials for university education. In: National Conference of JASMIN 2013 Autumn, Japan Society for Management Information, pp. 45–48, October 2013. (in Japanese)
4. Aramoto, M., Kobayashi, M., Nakazawa, M., Nakano, M., Goto, M., Hirasawa, S.: Learning analytics via visualization system of edit record - system configuration and implementation. In: 78th National Convention of Information Processing Society of Japan, vol. 4, pp. 527–528, March 2016. (in Japanese)
5. Nakano, M., Aramoto, M., Yoshida, S., Koutou, K.: Learning analytics via visualization system of edit record - application to english writing task: error gravity and error correction time. In: 78th National Convention of Information Processing Society of Japan, vol. 4, pp. 531–532, March 2016. (in Japanese)