Querying Concept-based Knowledge Bases

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\begin{bibtex} @inproceedings{DBLP:conf/pdk/LenzeriniS91,

 author    = {Maurizio Lenzerini and
              Andrea Schaerf},
 title     = {Querying Concept-based Knowledge Bases},
 booktitle = {PDK},
 year      = {1991},
 pages     = {107-123},
 crossref  = {DBLP:conf/pdk/1991},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}