<?xml version="1.0"?>
<dblp>
<article key="persons/Codd72" mdate="2002-01-03">
<author>E. F. Codd</author>
<title>Relational Completeness of Data Base Sublanguages.</title>
<journal>In: R. Rustin (ed.): Database Systems: 65-98, Prentice Hall and IBM Research Report RJ 987, San Jose, California</journal>
<month>March</month>
<year>1972</year>
<cdrom>ibmTR/rj987.pdf</cdrom>
<ee>db/labs/ibm/RJ987.html</ee>
</article>

</dblp>
