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Stoyanchev, S., A. Liu, and J. Hirschberg, "Modelling Human Clarification Strategies", Proceedings of the SIGDIAL 2013 Conference, Metz, France, Association for Computational Linguistics, pp. 137–141, August, 2013.
Liu, A., R. Sloan, M-V. Then, S. Stoyanchev, J. Hirschberg, and E. Shriberg, "Detecting Inappropriate Clarification Requests in Spoken Dialogue Systems", Proceedings of the 15th Annual Meeting of the Special Interest Group on Discourse and Dialogue (SIGDIAL), Philadelphia, PA, U.S.A., Association for Computational Linguistics, pp. 238–242, June, 2014.