A thematic hierarchy for efficient generation from lexical-conceptual structure Bonnie Dorr author Nizar Habash author David Traum author 1998-oct 28-31 text Proceedings of the Third Conference of the Association for Machine Translation in the Americas: Technical Papers David Farwell editor Laurie Gerber editor Eduard Hovy editor Springer Langhorne, PA, USA conference publication dorr-etal-1998-thematic https://aclanthology.org/1998.amta-papers.29/ 1998-oct 28-31 333 343