@Techreport{surevetter2002asoot, author = "York Sure-Vetter and Asun Gomez-Perez and Mariano Fernandez-Lopez and V. Christophides and Juergen Angele and Athur Stutt", institution = "Universidad Politecnia de Madrid", number = "1.3", title = "A survey on ontology tools", year = "2002", }