"Toshiyuki Takeda,Yasuhiro Hayashi,Katsusuke Shigeta,Hideki Mori,Daisuke Kaneko,Hidefumi Yagi,Tomohiro Nagashima","Visualizing Relationships among Contents Topics and Learning Activities of Online Courses","EdMedia + Innovate Learning 2018",,,,,"pp. 1355?1356",2018,June