Tight logic programs

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\begin{bibtex} @article{DBLP:journals/tplp/ErdemL03,

 author    = {Esra Erdem and
              Vladimir Lifschitz},
 title     = {Tight logic programs},
 journal   = {TPLP},
 volume    = {3},
 number    = {4-5},
 year      = {2003},
 pages     = {499-518},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}