Experience with an Easily Computed Metric for Ranking Alternative Parses George E Heidorn author 1982-06 text 20th Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Toronto, Ontario, Canada conference publication heidorn-1982-experience 10.3115/981251.981270 https://aclanthology.org/P82-1015/ 1982-06 82 84