<?xml version="1.0"?>
<dblp>
<article key="journals/tods/Codd79" mdate="2006-04-03">
<author>E. F. Codd</author>
<title>Extending the Database Relational Model to Capture More Meaning.</title>
<pages>397-434</pages>
<cdrom>TODS4/P397.PDF</cdrom>
<year>1979</year>
<volume>4</volume>
<journal>ACM Trans. Database Syst.</journal>
<number>4</number>
<url>db/journals/tods/tods4.html#Codd79</url>
<ee>http://doi.acm.org/10.1145/320107.320109</ee>
<ee>db/journals/tods/Codd79.html</ee>
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</article>
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