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@article{DBLP:journals/tods/Codd79,
author = {E. F. Codd},
title = {Extending the Database Relational Model to Capture More
Meaning},
journal = {ACM Trans. Database Syst.},
volume = {4},
number = {4},
year = {1979},
pages = {397-434},
ee = {http://doi.acm.org/10.1145/320107.320109},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
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