Exploiting the Scope of Negations and Heterogeneous Features for Relation Extraction: A Case Study for Drug-Drug Interaction Extraction Md. Faisal Mahbub Chowdhury author Alberto Lavelli author 2013-06 text Proceedings of the 2013 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Lucy Vanderwende editor Hal Daumé III editor Katrin Kirchhoff editor Association for Computational Linguistics Atlanta, Georgia conference publication chowdhury-lavelli-2013-exploiting https://aclanthology.org/N13-1093/ 2013-06 765 771