NewsInEssence: A System For Domain-Independent, Real-Time News Clustering and Multi-Document Summarization Dragomir R Radev author Sasha Blair-Goldensohn author Zhu Zhang author Revathi Sundara Raghavan author 2001 text Proceedings of the First International Conference on Human Language Technology Research conference publication radev-etal-2001-newsinessence https://aclanthology.org/H01-1056/ 2001