Multi-Document Summarisation Using Generic Relation Extraction Ben Hachey author 2009-08 text Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing Philipp Koehn editor Rada Mihalcea editor Association for Computational Linguistics Singapore conference publication hachey-2009-multi https://aclanthology.org/D09-1044/ 2009-08 420 429