Extracting and Normalizing Temporal Expressions Lois C Childs author David Cassel author 1998-10 text TIPSTER TEXT PROGRAM PHASE III: Proceedings of a Workshop held at Baltimore, Maryland, October 13-15, 1998 Association for Computational Linguistics Baltimore, Maryland, USA conference publication childs-cassel-1998-extracting 10.3115/1119089.1119104 https://aclanthology.org/X98-1011/ 1998-10 51 56