Corpora Annotated with Negation: An Overview Salud María Jiménez-Zafra author Roser Morante author María Teresa Martín-Valdivia author L Alfonso Ureña-López author 2020 text journal article Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal jimenez-zafra-etal-2020-corpora 10.1162/coli_a_00371 https://aclanthology.org/2020.cl-1.5/ 2020 46 1 1 52