Efficient Sentence Retrieval Based on Syntactic Structure Hiroshi Ichikawa author Keita Hakoda author Taiichi Hashimoto author Takenobu Tokunaga author 2006-07 text Proceedings of the COLING/ACL 2006 Main Conference Poster Sessions Association for Computational Linguistics Sydney, Australia conference publication ichikawa-etal-2006-efficient https://aclanthology.org/P06-2052/ 2006-07 399 406