@article{PeMH09a,
  title = "Tractable Query Answering and Rewriting under Description Logic Constraints",
  author = "H\'{e}ctor P\'{e}rez-Urbina and Boris Motik and Ian Horrocks",
  year = "2010",
  journal = "J.\ of Applied Logic",
  note = "DOI \url{10.1016/j.jal.2009.09.004}",
  number = "2",
  pages = "186--209",
  url = "download/2009/PeMH09a.pdf",
  volume = "8",
  doi = "10.1016/j.jal.2009.09.004",
}