Nanhong Ye Ajith Kodakateri Pudhiyaveetil Susan Gauch Mining Hidden Concepts for Ontology Extension Using Multivariate Probabilistic Modeling. 371-374 2009 Web Intelligence http://dx.doi.org/10.1109/WI-IAT.2009.65 conf/webi/2009 db/conf/webi/webi2009.html#YePG09