An Unsupervised Method for Uncovering Morphological Chains Karthik Narasimhan author Regina Barzilay author Tommi Jaakkola author 2015 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal narasimhan-etal-2015-unsupervised 10.1162/tacl_a_00130 https://aclanthology.org/Q15-1012/ 2015 3 157 167