Multilanguage Hierarchical Logics or: How we can do Without Modal Logics

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\begin{bibtex} @article{DBLP:journals/ai/GiunchigliaS94,

 author    = {Fausto Giunchiglia and
              Luciano Serafini},
 title     = {Multilanguage Hierarchical Logics or: How we can do Without
              Modal Logics},
 journal   = {Artif. Intell.},
 volume    = {65},
 number    = {1},
 year      = {1994},
 pages     = {29-70},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}