A Study on a Method of Estimating the Difficulty of Quizzes Focused on Quiz Types. - Shinichi Ikeda; Teruhiko Takagi; Masanori Takagi; Yoshimi Teshigawara (ICCE, 2011)

Calculating Test Item Similarity Using Latent Dirichlet Allocation. - Teruhiko Takagi; Masanori Takagi; Yoshimi Teshigawara; Kenji Tanaka (ICCE, 2013)