Dumitru Roman Uwe Keller Holger Lausen Jos de Bruijn Rubén Lara Michael Stollberg Axel Polleres Cristina Feier Christoph Bussler Dieter Fensel Web Service Modeling Ontology. 77-106 2005 1 Applied Ontology 1 http://iospress.metapress.com/openurl.asp?genre=article&issn=1570-5838&volume=1&issue=1&spage=77 db/journals/ao/ao1.html#RomanKLBLSPFBF05