... proposed for generating more coherent and less redun-dant summaries, such as HIERSUM (Haghighi and Vanderwende, 2009) and TTM (Celikyilmaz and Hakkani-Tur, 2011). For instance, HIERSUMmodels ... topic model obtained for thebackground in the TAC-2011 dataset, and the base and update models for collection D1110. Asexpected, the top unigrams and bigrams are allclosed-class words and auxiliary ... Association for Computational LinguisticsDualSum: a Topic -Model based approach for update summarizationJean-Yves DelortGoogle ResearchBrandschenkestrasse 1108002 Zurich, Switzerlandjydelort@google.comEnrique...