Class Hierarchies and Their Complexity

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\begin{bibtex} @inproceedings{DBLP:conf/dbpl/Lenzerini87,

 author    = {Maurizio Lenzerini},
 title     = {Class Hierarchies and Their Complexity},
 booktitle = {DBPL},
 year      = {1987},
 pages     = {43-65},
 ee        = {db/conf/dbpl/Lenzerini87.html},
 crossref  = {DBLP:conf/dbpl/87},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}