Classification of Feedback Expressions in Multimodal Data Costanza Navarretta author Patrizia Paggio author 2010-07 text Proceedings of the ACL 2010 Conference Short Papers Jan Hajič editor Sandra Carberry editor Stephen Clark editor Joakim Nivre editor Association for Computational Linguistics Uppsala, Sweden conference publication navarretta-paggio-2010-classification https://aclanthology.org/P10-2059/ 2010-07 318 324