An Empirical Model of Acknowledgment for Spoken-Language Systems David G Novick author Stephen Sutton author 1994-06 text 32nd Annual Meeting of the Association for Computational Linguistics Association for Computational Linguistics Las Cruces, New Mexico, USA conference publication novick-sutton-1994-empirical 10.3115/981732.981746 https://aclanthology.org/P94-1014/ 1994-06 96 101