@article{AIJ-2009,
  title = "Representing Ontologies Using Description Logics, Description Graphs and Rules",
  author = "Boris Motik, Bernardo Cuenca Grau, Ian Horrocks and Ulrike Sattler",
  year = "2009",
  journal = "Artificial Intelligence (AIJ)",
  number = "14",
  pages = "1275--1309",
  publisher = "Elsevier",
  url = "http://www.comlab.ox.ac.uk/people/boris.motik/pubs/mghs09graphs-journal.pdf",
  volume = "173",
}