@inproceedings{GlHS08b,
  title = "Unions of Conjunctive Queries in $\mathcal{SHOQ}$",
  author = "Birte Glimm and Ian Horrocks and Ulrike Sattler",
  year = "2008",
  booktitle = "Proc.\ of the 11th Int.\ Conf.\ on Principles of Knowledge Representation and Reasoning (KR~2008)",
  pages = "252--262",
  url = "download/2008/GlHS08b.pdf",
}