Using a Keyness Metric for Single and Multi Document Summarisation Mahmoud El-Haj author Paul Rayson author 2013-08 text Proceedings of the MultiLing 2013 Workshop on Multilingual Multi-document Summarization Association for Computational Linguistics Sofia, Bulgaria conference publication el-haj-rayson-2013-using https://aclanthology.org/W13-3109/ 2013-08 64 71