Modal Description Logics: Modalizing Roles

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\begin{bibtex} @article{DBLP:journals/fuin/WolterZ99,

 author    = {Frank Wolter and
              Michael Zakharyaschev},
 title     = {Modal Description Logics: Modalizing Roles},
 journal   = {Fundam. Inform.},
 volume    = {39},
 number    = {4},
 year      = {1999},
 pages     = {411-438},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}