Takashi Sato, Tomohiko Satomoto, Koto Han. NTCIR-3 PAT Experiments at Osaka Kyoiku University: Long Gram-based Index and Essential Words. In Keizo Oyama, Emi Ishida, Noriko Kando, editors, Proceedings of the Third NTCIR Workshop on Research in Information Retrieval, Automatic Text Summarization and Question Answering, NTCIR-3, Tokyo, Japan, October 8-10, 2002. National Institute of Informatics (NII), 2002. [doi]