@inproceedings{LSM2013IJCAI,
  title = "Preference-Based Query Answering in Datalog+⁄− Ontologies",
  author = "Thomas Lukasiewicz and Maria Vanina Martinez and Gerardo I. Simari",
  year = "2013",
  booktitle = "Proceedings of the 23rd International Joint Conference on Artificial Intelligence, IJCAI 2013, Beijing, China, August 3-9, 2013",
  editor = "Francesca Rossi",
  pages = "1017-1023",
  publisher = "AAAI Press / International Joint Conferences on Artificial Intelligence",
  url = "http://ijcai.org/papers13/Papers/IJCAI13-155.pdf",
}