@incollection{BaHS04a,
  title = "Description Logics",
  author = "Franz Baader and Ian Horrocks and Ulrike Sattler",
  year = "2004",
  booktitle = "Handbook on Ontologies",
  editor = "Steffen Staab and Rudi Studer",
  isbn = "3-540-40834-7",
  pages = "3--28",
  publisher = "Springer",
  series = "International Handbooks on Information Systems",
  url = "download/2004/BaHS04a.pdf",
}