Database Relations with Null Values.

@inproceedings{DBLP:conf/pods/Zaniolo82,
  author    = {Carlo Zaniolo},
  title     = {Database Relations with Null Values},
  booktitle = {Proceedings of the ACM Symposium on Principles of Database Systems,
               March 29-31, 1982, Los Angeles, California},
  publisher = {ACM},
  year      = {1982},
  pages     = {27-33},
  ee        = {http://doi.acm.org/10.1145/588111.588117, db/conf/pods/Zaniolo82.html},
  crossref  = {DBLP:conf/pods/82},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

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References

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E. F. Codd: Extending the Database Relational Model to Capture More Meaning. ACM Trans. Database Syst. 4(4): 397-434(1979)

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John Grant: Null Values in a Relational Data Base. Inf. Process. Lett. 6(5): 156-157(1977)

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Tomasz Imielinski, Witold Lipski Jr.: On Representing Incomplete Information in a Relational Data Base. VLDB 1981: 388-397

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Witold Lipski Jr.: On Semantic Issues Connected with Incomplete Information Databases. ACM Trans. Database Syst. 4(3): 262-296(1979)

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Y. Edmund Lien: Multivalued Dependencies with Null Values in Relational Data Bases. VLDB 1979: 61-66

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Jeffrey D. Ullman: Principles of Database Systems, 1st Edition. Computer Science Press 1980

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Yannis Vassiliou: Null Values in Data Base Management: A Denotational Semantics Approach. SIGMOD Conference 1979: 162-169

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Eugene Wong: A Statistical Approach to Incomplete Information in Database Systems. ACM Trans. Database Syst. 7(3): 470-488(1982)

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Carlo Zaniolo: Database Relations with Null Values. J. Comput. Syst. Sci. 28(1): 142-166(1984)