@Article{LuArHoSaJAIR05,
  author =       "C. Lutz and C. Areces and I. Horrocks and U. Sattler",
  title =        "Keys, Nominals, and Concrete Domains",
  journal =      "Journal of Artificial Intelligence Research",
  year = 	 {2005},
  volume =       "23",
  pages =        "667--726"
}