Two Components of an Action Language

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\begin{bibtex} @article{DBLP:journals/amai/Lifschitz97,

 author    = {Vladimir Lifschitz},
 title     = {Two Components of an Action Language},
 journal   = {Ann. Math. Artif. Intell.},
 volume    = {21},
 number    = {2-4},
 year      = {1997},
 pages     = {305-320},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}