Set-theoretic problems of null completion in relational databases

Incomplete Relational Database Models Based on Intervals

IEEE Transactions on Knowledge and Data Engineering
Current, Legacy, and Invalid Tuples in Conditionally Evolving Databases

ADVIS '02 Proceedings of the Second International Conference on Advances in Information Systems
Null values in fuzzy databases

Journal of Intelligent Information Systems
Consistency enforcement in databases

Proceedings of the 2nd international conference on Semantics in databases
NULL 'Value' Algebras and Logics

Proceedings of the 2011 conference on Information Modelling and Knowledge Bases XXII

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