Gerti Kappel Elisabeth Kapsammer Horst Kargl Gerhard Kramler Thomas Reiter Werner Retschitzegger Wieland Schwinger Manuel Wimmer Lifting Metamodels to Ontologies: A Step to the Semantic Integration of Modeling Languages. 528-542 2006 conf/models/2006 MoDELS http://dx.doi.org/10.1007/11880240_37 db/conf/models/models2006.html#KappelKKKRRSW06