A Unified Model of Phrasal and Sentential Evidence for Information Extraction Siddharth Patwardhan author Ellen Riloff 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 patwardhan-riloff-2009-unified https://aclanthology.org/D09-1016/ 2009-08 151 160