Head-Driven Phrase Structure Grammar Parsing on Penn Treebank Junru Zhou author Hai Zhao author 2019-07 text Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics Anna Korhonen editor David Traum editor Lluís Màrquez editor Association for Computational Linguistics Florence, Italy conference publication zhou-zhao-2019-head 10.18653/v1/P19-1230 https://aclanthology.org/P19-1230/ 2019-07 2396 2408