@inproceedings{PeMH08a,
  title = "Rewriting Conjunctive Queries over Description Logic Knowledge Bases",
  author = "H\'{e}ctor P\'{e}rez-Urbina and Boris Motik and Ian Horrocks",
  year = "2008",
  booktitle = "Proc.\ of the Int.\ Workshop on Semantics in Data and Knowledge Bases (SDKB 2008)",
  pages = "199--214",
  publisher = "Springer",
  series = "Lecture Notes in Computer Science",
  url = "download/2008/PeMH08a.pdf",
  volume = "4925",
}