Toward Completeness in Concept Extraction and Classification Eduard Hovy author Zornitsa Kozareva author Ellen Riloff author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication hovy-etal-2009-toward https://aclanthology.org/D09-1099/ 2009-08 948 957