The Relation between Comments Inserted onto Digital Textbooks by Students and Grades Earned in the Course. - Akihiro Motoki; Tomoko Harada; Takashi Nagatsuka (ICADL, 2010)

Effect of the Number of Comments Inserted by Students during Each Lecture on Their Grades in the Course. - Akihiro Motoki; Tomoko Harada; Takashi Nagatsuka (ICADL, 2011)