A Common Theory of Information Fusion from Multiple Text Sources Step One: Cross-Document Structure Dragomir Radev author 2000-10 text 1st SIGdial Workshop on Discourse and Dialogue Association for Computational Linguistics Hong Kong, China conference publication radev-2000-common 10.3115/1117736.1117745 https://aclanthology.org/W00-1009/ 2000-10 74 83