@inproceedings{StoilosSSWS11,
  title = "Query Rewriting Under Query Extensions for OWL 2 QL Ontologies",
  author = "Tassos Venetis and Giorgos Stoilos and Giorgos Stamou",
  year = "2011",
  booktitle = "Proceedings of the  7th International Workshop on Scalable Semantic Web Knowledge Base Systems (SSWS2011)",
}