Causes and Strategies for Requesting Clarification in Dialogue David Schlangen author 2004-apr 30 - may 1 text Proceedings of the 5th SIGdial Workshop on Discourse and Dialogue at HLT-NAACL 2004 Association for Computational Linguistics Cambridge, Massachusetts, USA conference publication schlangen-2004-causes https://aclanthology.org/W04-2325/ 2004-apr 30 - may 1 136 143