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@article{DBLP:persons/Codd72,
author = {E. F. Codd},
title = {Relational Completeness of Data Base Sublanguages},
journal = {In: R. Rustin (ed.): Database Systems: 65-98, Prentice Hall
and IBM Research Report RJ 987, San Jose, California},
year = {1972},
ee = {db/labs/ibm/RJ987.html},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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