An open-source tool for negation detection: a maximum-margin approach Martine Enger author Erik Velldal author Lilja Øvrelid author 2017-04 text Proceedings of the Workshop Computational Semantics Beyond Events and Roles Eduardo Blanco editor Roser Morante editor Roser Saurí editor Association for Computational Linguistics Valencia, Spain conference publication enger-etal-2017-open 10.18653/v1/W17-1810 https://aclanthology.org/W17-1810/ 2017-04 64 69