Adding Noun Phrase Structure to the Penn Treebank David Vadas author James Curran author 2007-06 text Proceedings of the 45th Annual Meeting of the Association of Computational Linguistics Annie Zaenen editor Antal van den Bosch editor Association for Computational Linguistics Prague, Czech Republic conference publication vadas-curran-2007-adding https://aclanthology.org/P07-1031/ 2007-06 240 247