Marek Reformat Ronald R. Yager Zhan Li Ontology Enhanced Concept Hierarchies for Text Identification. 16-43 2008 4 Int. J. Semantic Web Inf. Syst. 3 http://www.igi-pub.com/articles/details.asp?ID=33325 db/journals/ijswis/ijswis4.html#ReformatYL08