@InProceedings{BrandtKuesters+DL02,
  author = 	 {S. Brandt and R. K\"usters and A.-Y. Turhan},
  title = 	 {Approximating $\cal{ALCN}$-Concept Descriptions},
  booktitle =    "Proceedings of the 2002 International Workshop on Description Logics",
  year =         "2002"
}