Hierarchy Extraction based on Inclusion of Appearance Eiko Yamamoto author Kyoko Kanzaki author Hitoshi Isahara author 2004-07 text Proceedings of the ACL Interactive Poster and Demonstration Sessions Association for Computational Linguistics Barcelona, Spain conference publication yamamoto-etal-2004-hierarchy https://aclanthology.org/P04-3015/ 2004-07 150 153