Unsupervised Event Coreference Resolution Cosmin Adrian Bejan author Sanda Harabagiu author 2014-06 text journal article Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal adrian-bejan-harabagiu-2014-unsupervised 10.1162/COLI_a_00174 https://aclanthology.org/J14-2004/ 2014-06 40 2 311 347