@inproceedings{Horr05c,
  title = "OWL: A Description Logic Based Ontology Language.",
  author = "Ian Horrocks",
  year = "2005",
  booktitle = "Proc.\ of Int.\ Conf.\ on Principles and Practice of Constraint Programming (CP 2005)",
  isbn = "3-540-29238-1",
  pages = "5-8",
  publisher = "Springer",
  series = "Lecture Notes in Computer Science",
  url = "download/2005/Horr05c.pdf",
  volume = "3709",
}