@inproceedings{GlHS08a,
  title = "Unions of Conjunctive Queries in SHOQ",
  author = "Birte Glimm and Ian Horrocks and Ulrike Sattler",
  year = "2008",
  booktitle = "Proceedings of the 11th International Conference on the Principles of Knowledge Representation and Reasoning (KR-08)",
  pages = "252-262",
  publisher = "AAAI Press/The MIT Press",
}