NTCIR-2 Experiments Using Long Gram Based Indices. - Takashi Sato 005; Nao Hatta; Koji Hiraiwa; Kihei Kobata; Akihiro Furusho; Koto Han (NTCIR, 2001)

NTCIR-3 CLIR Experiments at Osaka Kyoiku University - Comparison of Gram-based Indices. - Takashi Sato 005; Koto Han (NTCIR, 2002)

NTCIR-3 PAT Experiments at Osaka Kyoiku University: Long Gram-based Index and Essential Words. - Takashi Sato 005; Tomohiko Satomoto; Koto Han (NTCIR, 2002)