Missing Information (Applicable and Inapplicable) in Relational Databases. Codd, E F SIGMOD Record, 15:53–78, 1986. Series Number: 4
bibtex   
@article{Codd:86,
	title = {Missing {Information} ({Applicable} and {Inapplicable}) in {Relational} {Databases}},
	volume = {15},
	journal = {SIGMOD Record},
	author = {Codd, E F},
	year = {1986},
	note = {Series Number: 4},
	pages = {53--78},
}

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