Decidable containment of recursive queries

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\begin{bibtex} @article{DBLP:journals/tcs/CalvaneseGV05,

 author    = {Diego Calvanese and
              Giuseppe De Giacomo and
              Moshe Y. Vardi},
 title     = {Decidable containment of recursive queries},
 journal   = {Theor. Comput. Sci.},
 volume    = {336},
 number    = {1},
 year      = {2005},
 pages     = {33-56},
 ee        = {http://dx.doi.org/10.1016/j.tcs.2004.10.031},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}