@article{12:83,author={Elias Zavitsanos and Georgios Paliouras and George A. Vouros}, Title={Non-Parametric Estimation of Topic Hierarchies from Texts with Hierarchical Dirichlet Processes},journal={Journal of Machine Learning Research},volume={12}, url={http://www.jmlr.org/papers/volume12/zavitsanos11a/zavitsanos11a.pdf}}