Poly-co: An Unsupervised Co-reference Detection System Éric Charton author Michel Gagnon author Benoit Ozell author 2010-07 text Proceedings of the 6th International Natural Language Generation Conference John Kelleher editor Brian Mac Namee editor Ielka van der Sluis editor Association for Computational Linguistics conference publication charton-etal-2010-poly https://aclanthology.org/W10-4228/ 2010-07