@article{12:14,author={Jennifer Gillenwater and Kuzman Ganchev and Joo Graa and Fernando Pereira and Ben Taskar}, Title={Posterior Sparsity in Unsupervised Dependency Parsing},journal={Journal of Machine Learning Research},volume={12}, url={http://www.jmlr.org/papers/volume12/gillenwater11a/gillenwater11a.pdf}}