An Epistemic Operator for Description Logics

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\begin{bibtex} @article{DBLP:journals/ai/DoniniLNNS98,

 author    = {Francesco M. Donini and
              Maurizio Lenzerini and
              Daniele Nardi and
              Werner Nutt and
              Andrea Schaerf},
 title     = {An Epistemic Operator for Description Logics},
 journal   = {Artif. Intell.},
 volume    = {100},
 number    = {1-2},
 year      = {1998},
 pages     = {225-274},
 ee        = {http://dx.doi.org/10.1016/S0004-3702(98)00009-5},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}