Data complexity of answering conjunctive queries over SHIQ knowledge bases

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\begin{bibtex} @article{DBLP:journals/corr/abs-cs-0507059,

 author    = {Magdalena Ortiz and
              Diego Calvanese and
              Thomas Eiter and
              Enrico Franconi},
 title     = {Data complexity of answering conjunctive queries over SHIQ
              knowledge bases},
 journal   = {CoRR},
 volume    = {abs/cs/0507059},
 year      = {2005},
 ee        = {http://arxiv.org/abs/cs/0507059},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}