Natural Language Generation with Tree Conditional Random Fields Wei Lu author Hwee Tou Ng author Wee Sun Lee author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication lu-etal-2009-natural https://aclanthology.org/D09-1042/ 2009-08 400 409