Singletons and Coreference Resolution Evaluation Sandra Kübler author Desislava Zhekova author 2011-09 text Proceedings of the International Conference Recent Advances in Natural Language Processing 2011 Ruslan Mitkov editor Galia Angelova editor Association for Computational Linguistics Hissar, Bulgaria conference publication kubler-zhekova-2011-singletons https://aclanthology.org/R11-1036/ 2011-09 261 267