Aggregate queries over ontologies

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\begin{bibtex} @inproceedings{DBLP:conf/cikm/CalvaneseKNT08,

 author    = {Diego Calvanese and
              Evgeny Kharlamov and
              Werner Nutt and
              Camilo Thorne},
 title     = {Aggregate queries over ontologies},
 booktitle = {ONISW},
 year      = {2008},
 pages     = {97-104},
 ee        = {http://doi.acm.org/10.1145/1458484.1458500},
 crossref  = {DBLP:conf/cikm/2008onisw},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}