Conjunctive query containment and answering under description logic constraints

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\begin{bibtex} @article{DBLP:journals/tocl/CalvaneseGL08,

 author    = {Diego Calvanese and
              Giuseppe De Giacomo and
              Maurizio Lenzerini},
 title     = {Conjunctive query containment and answering under description
              logic constraints},
 journal   = {ACM Trans. Comput. Log.},
 volume    = {9},
 number    = {3},
 year      = {2008},
 ee        = {http://doi.acm.org/10.1145/1352582.1352590},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}