Preferential Default Description Logics

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\begin{bibtex} @TECHREPORT{DBLP:tr/tu-berlin/QuantzR92,

 author = {J.J. Quantz and M. Ryan.},
 title = {Preferential Default Description Logics},
 institution = {Technische Universitat, Berlin},
 year = {1993},
 number = {KIT 110}

} \end{bibtex}