@incollection{GOP*12,
  title = "Datalog and its extensions for the semantic web",
  author = "Georg Gottlob and Giorgio Orsi and Andreas Pieris and Mantas Simkus",
  year = "2012",
  booktitle = "Reasoning Web 2012",
  editor = "T. Eiter and T. Krennwallner",
  pages = "54--77",
  url = "http://link.springer.com/chapter/10.1007%2F978-3-642-33158-9_2",
  doi = "10.1007/978-3-642-33158-9_2",
}