1. Fedora Users: http://www.fedora.info/about/deployment.shtml
2. Zia, L.L.: The NSF National Science, Technology, Engineering, and Mathematics Education Digital Library (NSDL) Program. D-Lib Mag. 8(11) (2002)
3. Sowa, J.F.: Knowledge Representation: Logical, Philosophical, and Computational Foundations. Brooks/Cole, Pacific Grove, CA (2000)
4. Brickley, D., Guha, R.V.: RDF Vocabulary Description Language 1.0: RDF Schema. Recommendation, http://www.w3.org/TR/rdf-schema/
5. Dean, M., Connolly, D., van Harmelen, F., Hendler, J., Horrocks, I., McGuinness, D.L., Patel-Schneider, P.F., Stein, L.A.: OWL Web Ontology Language 1.0 Reference. W3C Working Draft, 20020729, http://www.w3.org/TR/2002/WD-owl-ref-20020729/