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@book{DBLP:books/cs/Ullman82,
author = {Jeffrey D. Ullman},
title = {Principles of Database Systems, 2nd Edition},
publisher = {Computer Science Press},
year = {1982},
isbn = {0-914894-36-6},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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