Strongly equivalent logic programs

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\begin{bibtex} @article{DBLP:journals/tocl/LifschitzPV01,

 author    = {Vladimir Lifschitz and
              David Pearce and
              Agust\'{\i}n Valverde},
 title     = {Strongly equivalent logic programs},
 journal   = {ACM Trans. Comput. Log.},
 volume    = {2},
 number    = {4},
 year      = {2001},
 pages     = {526-541},
 ee        = {http://doi.acm.org/10.1145/502166.502170},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}