A Computational Method of Complexity of Questions on Contents of English Sentences and its Evaluation. - Hidenobu Kunichika; Minoru Urushima; Tsukasa Hirashima; Akira Takeuchi (ICCE, 2002)

Realizing Adaptive Questions and Answers for ICALL Systems. - Hidenobu Kunichika; Minoru Urushima; Tsukasa Hirashima; Akira Takeuchi (AIED, 2005)