Nested Expressions in Logic Programs

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\begin{bibtex} @article{DBLP:journals/amai/LifschitzTT99,

 author    = {Vladimir Lifschitz and
              Lappoon R. Tang and
              Hudson Turner},
 title     = {Nested Expressions in Logic Programs},
 journal   = {Ann. Math. Artif. Intell.},
 volume    = {25},
 number    = {3-4},
 year      = {1999},
 pages     = {369-389},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}