Closed-World Databases and Circumscription

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\begin{bibtex} @article{DBLP:journals/ai/Lifschitz85,

 author    = {Vladimir Lifschitz},
 title     = {Closed-World Databases and Circumscription},
 journal   = {Artif. Intell.},
 volume    = {27},
 number    = {2},
 year      = {1985},
 pages     = {229-235},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}