@inproceedings{HoPa04a,
  title = "A Proposal for an {OWL} Rules Language",
  author = "Ian Horrocks and Peter F.\ Patel-Schneider",
  year = "2004",
  booktitle = "Proc.\ of the Thirteenth International World Wide Web Conference (WWW 2004)",
  isbn = "1-58113-844-X",
  pages = "723--731",
  publisher = "ACM",
  url = "download/2004/HoPa04a.pdf",
}