PTB Graph Parsing with Tree Approximation Yoshihide Kato author Shigeki Matsubara 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 kato-matsubara-2019-ptb 10.18653/v1/P19-1530 https://aclanthology.org/P19-1530/ 2019-07 5344 5349