An Improved Heuristic for Ellipsis Processing Ralph M Weischedel author Norman K Sondheimer author 1982-06 text 20th Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Toronto, Ontario, Canada conference publication weischedel-sondheimer-1982-improved 10.3115/981251.981271 https://aclanthology.org/P82-1016/ 1982-06 85 88