Formal Ontology for Subject

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\begin{bibtex} @article{DBLP:journals/dke/WeltyJ99,

 author    = {Christopher A. Welty and
              Jessica Jenkins},
 title     = {Formal Ontology for Subject},
 journal   = {Data Knowl. Eng.},
 volume    = {31},
 number    = {2},
 year      = {1999},
 pages     = {155-181},
 ee        = {http://dx.doi.org/10.1016/S0169-023X(99)90021-6},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}