Improved Unsupervised POS Induction Using Intrinsic Clustering Quality and a Zipfian Constraint Roi Reichart author Raanan Fattal author Ari Rappoport author 2010-07 text Proceedings of the Fourteenth Conference on Computational Natural Language Learning Mirella Lapata editor Anoop Sarkar editor Association for Computational Linguistics Uppsala, Sweden conference publication reichart-etal-2010-improved https://aclanthology.org/W10-2909/ 2010-07 57 66