Formal Treatment of Incomplete Information in Type Data Bases
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\begin{bibtex} @inproceedings{DBLP:conf/ismis/Lenzerini87,
author = {Maurizio Lenzerini},
title = {Formal Treatment of Incomplete Information in Type Data
Bases},
booktitle = {ISMIS},
year = {1987},
pages = {167-174},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
\end{bibtex}
