Never Look Back: An Alternative to Centering Michael Strube author 1998-08 text 36th Annual Meeting of the Association for Computational Linguistics and 17th International Conference on Computational Linguistics, Volume 2 Association for Computational Linguistics Montreal, Quebec, Canada conference publication strube-1998-never-look 10.3115/980691.980773 https://aclanthology.org/P98-2204/ 1998-08 1251 1257