A Relational Model of Data for Large Shared Data Banks by E. F. Codd (source code)

= A Relational Model of Data for Large Shared Data Banks by E. F. Codd
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{tag=Work by E. F. Codd}
{title2=1970}

By <E. F. Codd>.

Primary source: https://db.dobo.sk/wp-content/uploads/2015/11/Codd_1970_A_relational_model.pdf

Abstract and sections 1.1–1.3, data independence and relations.