Spectral Unsupervised Parsing with Additive Tree Metrics Ankur P Parikh author Shay B Cohen author Eric P Xing author 2014-06 text Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Kristina Toutanova editor Hua Wu editor Association for Computational Linguistics Baltimore, Maryland conference publication parikh-etal-2014-spectral 10.3115/v1/P14-1100 https://aclanthology.org/P14-1100/ 2014-06 1062 1072