Logic Programs with Classical Negation

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\begin{bibtex} @inproceedings{DBLP:conf/iclp/GelfondL90,

 author    = {Michael Gelfond and
              Vladimir Lifschitz},
 title     = {Logic Programs with Classical Negation},
 booktitle = {ICLP},
 year      = {1990},
 pages     = {579-597},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}