Unsupervised Learning of Morphological Forests Jiaming Luo author Karthik Narasimhan author Regina Barzilay author 2017 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal luo-etal-2017-unsupervised 10.1162/tacl_a_00066 https://aclanthology.org/Q17-1025/ 2017 5 353 364