@conference {8, title = {Discovering Subsumption Hierarchies of Ontology Concepts from Text Corpora}, booktitle = {IEEE/WIC/ACM International Conference on Web Intelligence}, year = {2007}, month = {11/2007}, pages = {402-408}, doi = {10.1109/WI.2007.47}, author = {E. Zavitsanos and G. Paliouras and G. Vouros and S. Petridis} }