@InProceedings{Ghilardi-Lutz-Wolter-06,
  author    = {Silvio Ghilardi and Carsten Lutz and Frank Wolter},
  title     = {Did I Damage My Ontology? A Case for Conservative Extensions
               in Description Logics},
  booktitle = {Proceedings of KR2006: the 20th International Conference on Principles
               of Knowledge Representation and Reasoning, Lake District, UK, June 2--5, 2006},
  editor    = {Patrick Doherty and John Mylopoulos and Christopher A. Welty},
  year      = {2006},
  pages     = {187--197},
  publisher = {AAAI Press},
}