CoNLL-2011 Shared Task: Modeling Unrestricted Coreference in OntoNotes Sameer Pradhan author Lance Ramshaw author Mitchell Marcus author Martha Palmer author Ralph Weischedel author Nianwen Xue author 2011-06 text Proceedings of the Fifteenth Conference on Computational Natural Language Learning: Shared Task Sameer Pradhan editor Association for Computational Linguistics Portland, Oregon, USA conference publication pradhan-etal-2011-conll https://aclanthology.org/W11-1901/ 2011-06 1 27