@inproceedings{ijcai2009p131,
  title     = {Query Answering in Description Logics with Transitive Roles},
  author    = {Eiter, Thomas and Lutz, Carsten and Ortiz, Magdalena and Simkus, Mantas},
  booktitle = {Proceedings of the Twenty-First International Joint Conference on
               Artificial Intelligence, {IJCAI-09}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Hiroaki Kitano},
  pages     = {759--763},
  year      = {2009},
  url       = {https://ijcai.org/proceedings/2009/131},
}