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@book{DBLP:books/cs/Ullman88,
author = {Jeffrey D. Ullman},
title = {Principles of Database and Knowledge-Base Systems, Volume
I},
publisher = {Computer Science Press},
year = {1988},
isbn = {0-7167-8158-1},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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