A Layered Approach to NLP-Based Information Retrieval Sharon Flank author 1998-08 text 36th Annual Meeting of the Association for Computational Linguistics and 17th International Conference on Computational Linguistics, Volume 1 Association for Computational Linguistics Montreal, Quebec, Canada conference publication flank-1998-layered-approach 10.3115/980845.980913 https://aclanthology.org/P98-1066/ 1998-08 397 403