Identification of Event Mentions and their Semantic Class Steven Bethard author James H Martin author 2006-07 text Proceedings of the 2006 Conference on Empirical Methods in Natural Language Processing Dan Jurafsky editor Eric Gaussier editor Association for Computational Linguistics Sydney, Australia conference publication bethard-martin-2006-identification https://aclanthology.org/W06-1618/ 2006-07 146 154