@inproceedings{KR-2012-explanation,
  title = "The Complexity of Explaining Negative Query Answers in DL-Lite",
  author = "Diego Calvanese and Magdalena Ortiz and Mantas Simkus and Giorgio Stefanoni",
  year = "2012",
  journal = "Proc. of the 13th Int. Conf. on the Principles of Knowledge Representation and Reasoning (KR 2012)",
}