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* John Grant, [http://www09.sigmod.org/sigmod/record/issues/0809/p23.grant.pdf Null Values in SQL]. SIGMOD Record, September 2008 (Vol. 37, No. 3)
* Waraporn, Narongrit, and Kriengkrai Porkaew. "[http://www.iaeng.org/IJCS/issues_v35/issue_3/IJCS_35_3_08.pdf Null semantics for subqueries and atomic predicates]". [[IAENG]] International Journal of Computer Science 35.3 (2008): 305-313.
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* 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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