@InProceedings{LuAcHoSa-IJCAI-03,
  author =       {C. Lutz and C. Areces and I. Horrocks and U. Sattler},
  title =        {Keys, Nominals, and Concrete Domains},
  booktitle =    {Proceedings of the Eighteenth International Joint
  Conference on Artificial Intelligence {IJCAI-03}},
  year =         2003,
  address =      {Acapulco, Mexico},
  publisher =    {Morgan-Kaufmann Publishers}
}