Annotation and Classification of an Email Importance Corpus Fan Zhang author Kui Xu author 2015-07 text Proceedings of the 53rd Annual Meeting of the Association for Computational Linguistics and the 7th International Joint Conference on Natural Language Processing (Volume 2: Short Papers) Chengqing Zong editor Michael Strube editor Association for Computational Linguistics Beijing, China conference publication zhang-xu-2015-annotation 10.3115/v1/P15-2107 https://aclanthology.org/P15-2107/ 2015-07 651 656