Type data bases with incomplete information

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\begin{bibtex} @article{DBLP:journals/isci/Lenzerini91,

 author    = {Maurizio Lenzerini},
 title     = {Type data bases with incomplete information},
 journal   = {Inf. Sci.},
 volume    = {53},
 number    = {1-2},
 year      = {1991},
 pages     = {61-87},
 ee        = {http://dx.doi.org/10.1016/0020-0255(91)90058-3},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}