@inproceedings{ijcai2013p155,
  title     = {Preference-Based Query Answering in Datalog+/- Ontologies},
  author    = {Lukasiewicz, Thomas and Martínez, María Vanina and Simari, Gerardo Ignacio},
  booktitle = {Proceedings of the Twenty-Third International Joint Conference on
               Artificial Intelligence, {IJCAI-13}},
  publisher = {AAAI Press / International Joint Conferences on Artificial Intelligence},
  editor    = {Francesca Rossi},
  pages     = {1017--1022},
  year      = {2013},
  month     = {8},
  url       = {https://ijcai.org/proceedings/2013/155},
}