@inproceedings{CTT100772509,
  author = {Toshiyuki Takeda and Yasuhiro Hayashi and Katsusuke Shigeta and Hideki Mori and Daisuke Kaneko and Hidefumi Yagi and Tomohiro Nagashima},
  title = {Visualizing Relationships among Contents Topics and Learning Activities of Online Courses},
  booktitle = {},
  year = 2018,
}