@inproceedings{KoGH11c,
  title = "Answering Queries over OWL Ontologies with SPARQL",
  author = "Ilianna Kollia and Birte Glimm and Ian Horrocks",
  year = "2011",
  booktitle = "Proceedings of the 8th International Workshop on OWL: Experiences and Directions  (OWLED 2011)",
}