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* {{cite journal|authors=Bernhard Thalheim, Klaus-Dieter Schewe|title=NULL 'Value' Algebras and Logics|journal=Frontiers in Artificial Intelligence and Applications|volume=225|issue=Information Modelling and Knowledge Bases XXII|url=https://zenodo.org/record/1038419|doi=10.3233/978-1-60750-690-4-354|year=2011}}
* Enrico Franconi and Sergio Tessaris, [http://ceur-ws.org/Vol-866/paper8.pdf On the Logic of SQL Nulls], Proceedings of the 6th Alberto Mendelzon International Workshop on Foundations of Data Management, Ouro Preto, Brazil, June 27–30, 2012. pp. 114–128
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==External links==
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