@article {206,
	title = {Non-Parametric Estimation of Topic Hierarchies from Texts  with Hierarchical Dirichlet Processes},
	journal = {JMLR},
	volume = {12},
	year = {2011},
	pages = {2749-2775},
	author = {E. Zavitsanos and G. Paliouras and G. Vouros}
}
