@inproceedings{Vassiliou:79,
	address = {New York},
	title = {Null {Values} in {Database} {Management} - a {Denotational} {Semantics} {Approach}},
	booktitle = {Proceedings of the {ACM} {SIGMOD} {International} {Conference} on the {Management} of {Data}},
	publisher = {ACM},
	author = {Vassiliou, Y},
	year = {1979},
}

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