Learning to Classify Email into “Speech Acts” William W Cohen author Vitor R Carvalho author Tom M Mitchell author 2004-07 text Proceedings of the 2004 Conference on Empirical Methods in Natural Language Processing Dekang Lin editor Dekai Wu editor Association for Computational Linguistics Barcelona, Spain conference publication cohen-etal-2004-learning https://aclanthology.org/W04-3240/ 2004-07 309 316