@incollection{CGO*12b,
  title = "On the Interaction of Existential Rules and Equality Constraints in Ontology Querying",
  author = "Andrea Cal{\`i} and Georg Gottlob and Giorgio Orsi and Andreas Pieris",
  year = "2012",
  booktitle = "Correct Reasoning: Essays on Logic-Based AI in honor of Vladimir Lifschitz",
  editor = "E. Erdem and J. Lee and Y. Lierler and D. Pearce",
  url = "http://www.springerlink.com/content/48597j0644731530/",
  doi = "10.1007/978-3-642-30743-0_9",
}