Conservative Extensions in Expressive Description Logics
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\begin{bibtex} @inproceedings{DBLP:conf/ijcai/LutzWW07, title={Conservative Extensions in Expressive Description Logics}, pages={453-458}, year={2007}, crossref={DBLP:conf/ijcai/2007}, booktitle={IJCAI}, ee={http://www.ijcai.org/papers07/Papers/IJCAI07-071.pdf}, url={http://www.informatik.uni-trier.de/~ley/db/conf/ijcai/ijcai2007.html#LutzWW07}, author={Carsten Lutz and Dirk Walther and Frank Wolter} }\end{bibtex}
