@inproceedings{DBLP:conf/icdt/CaliGL09,
  title = "Datalog<sup>±</sup>: A Unified Approach to Ontologies and Integrity Constraints",
  author = "Andrea Cal\`{\i} and Georg Gottlob and Thomas Lukasiewicz",
  year = "2009",
  booktitle = "Proceedings of the 12th International Conference on Database Theory, ICDT 2009, St. Petersburg, Russia, March 23-25, 2009",
  editor = "Ronald Fagin",
  isbn = "978-1-60558-423-2",
  pages = "14-30",
  publisher = "ACM Press",
  series = "ACM International Conference Proceeding Series",
  url = "http://dl.acm.org/citation.cfm?doid=1514894.1514897",
  volume = "361",
}