@article{GHLS08a,
  title = "Conjunctive Query Answering for the Description Logic SHIQ",
  author = "Birte Glimm and Ian Horrocks and Carsten Lutz and Uli Sattler",
  year = "2008",
  journal = "Journal of Artificial Intelligence Research",
  pages = "151--198",
  volume = "31",
}