Parallel Algorithms for Unsupervised Tagging Sujith Ravi author Sergei Vassilivitskii author Vibhor Rastogi author 2014 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal ravi-etal-2014-parallel 10.1162/tacl_a_00169 https://aclanthology.org/Q14-1009/ 2014 2 105 118