@inproceedings{Gottlob/Zicari:88,
	title = {Closed {World} {Databases} {Opened} {Through} {Null} {Values}},
	booktitle = {Proceedings of the 14th {International} {Conference} on {Very} {Large} {Databases}},
	publisher = {???},
	author = {Gottlob, G and Zicari, R},
	year = {1988},
	pages = {50--61},
}

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