%0 Conference Paper %B IEEE/WIC/ACM International Conference on Web Intelligence %D 2007 %T Discovering Subsumption Hierarchies of Ontology Concepts from Text Corpora %A E. Zavitsanos %A G. Paliouras %A G. Vouros %A S. Petridis %B IEEE/WIC/ACM International Conference on Web Intelligence %8 11/2007 %R 10.1109/WI.2007.47