Sentiment Sentence Extraction Using a Hierarchical Directed Acyclic Graph Structure and a Bootstrap Approach Kazutaka Shimada author Daigo Hashimoto author Tsutomu Endo author 2008-11 text Proceedings of the 22nd Pacific Asia Conference on Language, Information and Computation Rachel Edita O Roxas editor De La Salle University, Manila, Philippines The University of the Philippines Visayas Cebu College, Cebu City, Philippines conference publication shimada-etal-2008-sentiment https://aclanthology.org/Y08-1034/ 2008-11 341 349