1. World Wide Web Consortium: Semantic Web (2001), http://www.w3c.org/2001/sw/
2. World Wide Web Consortium: Resource Description Framework Model and Syntax Specification (1999), http://www.w3.org/TR/1999/REC-rdf-syntax-19990222/
3. World Wide Web Consortium: Resource Description Framework Schema Specification 1.0. (2000), http://www.w3.org/TR/2000/CR-rdf-schema-20000327/
4. World Wide Web Consortium: Survey of RDF/Triple Data Stores (2001), http://www.w3.org/2001/05/rdf-ds/DataStore
5. Alexaki, S., Christophides, V., Karvounarakis, G., Plexousakis, D., Tolle, K.: The RDFSuite: Managing Voluminous RDF Description Bases. Technical report, Institute of Computer Science, FORTH, Heraklion, Greece (2000), http://www.ics.forth.gr/proj/isst/RDF/RSSDB/rdfsuite.pdf