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@article{DBLP:persons/Codd71,
author = {E. F. Codd},
title = {Data Base Sublanguage Founded on the Relational Calculus},
journal = {IBM Research Report, San Jose, California},
volume = {RJ893},
year = {1971},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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