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== References ==
* {{Cite book |last=Abiteboul |first=Serge |url=https://www.amazon.com/Foundations-Databases-Logical-Serge-Abiteboul/dp/0201537710 |title=Foundations of Databases: The Logical Level |last2=Hull |first2=Richard |last3=Vianu |first3=Victor |date=1994-12-02 |publisher=Pearson |isbn=978-0-201-53771-0 |___location=Reading, Mass. |language=English | url=http://webdam.inria.fr/Alice/pdfs/all.pdf}}
== Notes ==
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