Single-Document Summarization as a Tree Knapsack Problem Tsutomu Hirao author Yasuhisa Yoshida author Masaaki Nishino author Norihito Yasuda author Masaaki Nagata author 2013-10 text Proceedings of the 2013 Conference on Empirical Methods in Natural Language Processing David Yarowsky editor Timothy Baldwin editor Anna Korhonen editor Karen Livescu editor Steven Bethard editor Association for Computational Linguistics Seattle, Washington, USA conference publication hirao-etal-2013-single https://aclanthology.org/D13-1158/ 2013-10 1515 1520