The problem of incomplete information in relational databases

Gösta Grahne: The problem of incomplete information in relational databases. PhD thesis, Report A-1989-1, Department of Computer Science, University of Helsinki, 1989. 156 pages. <http://www.cs.helsinki.fi/TR/A-1989/1>

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F.2.2, H.2.1, H.2.3, I.2.3, I.2.4

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