Unsupervised Discovery of Scenario-Level Patterns for Information Extraction Roman Yangarber author Ralph Grishman author Pasi Tapanainen author 2000-04 text Sixth Applied Natural Language Processing Conference Association for Computational Linguistics Seattle, Washington, USA conference publication yangarber-etal-2000-unsupervised 10.3115/974147.974186 https://aclanthology.org/A00-1039/ 2000-04 282 289