Biomedical Event Extraction by Multi-class Classification of Pairs of Text Entities Xiao Liu author Antoine Bordes author Yves Grandvalet author 2013-08 text Proceedings of the BioNLP Shared Task 2013 Workshop Claire Nédellec editor Robert Bossy editor Jin-Dong Kim editor Jung-jae Kim editor Tomoko Ohta editor Sampo Pyysalo editor Pierre Zweigenbaum editor Association for Computational Linguistics Sofia, Bulgaria conference publication liu-etal-2013-biomedical https://aclanthology.org/W13-2006/ 2013-08 45 49