@inproceedings{KoGH11a,
  title = "SPARQL Query Answering over OWL Ontologies",
  author = "Ilianna Kollia and Birte Glimm and Ian Horrocks",
  year = "2011",
  booktitle = "Proceedings of the 8th Extended Semantic Web Conference (ESWC 2011)",
  note = "To Appear",
  publisher = "Springer Verlag",
  series = "LNCS",
}