SEXTANT: Exploring Unexplored Contexts for Semantic Extraction From Syntactic Analysis Gregory Grefenstette author 1992-06 text 30th Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Newark, Delaware, USA conference publication grefenstette-1992-sextant 10.3115/981967.982020 https://aclanthology.org/P92-1052/ 1992-06 324 326