@article{Horrocks01n,
  title = "Enabling knowledge representation on the Web by Extending {RDF} Schema",
  author = "J. Broekstra and M. Klein and S. Decker and D. Fensel and F. van Harmelen and I. Horrocks",
  year = "2002",
  journal = "Computer Networks",
  number = "5",
  pages = "609--634",
  url = "download/2002/Horrocks01n.pdf",
  volume = "39",
}