Easy-first Coreference Resolution Veselin Stoyanov author Jason Eisner author 2012-12 text Proceedings of COLING 2012 Martin Kay editor Christian Boitet editor The COLING 2012 Organizing Committee Mumbai, India conference publication stoyanov-eisner-2012-easy https://aclanthology.org/C12-1154/ 2012-12 2519 2534