A Relational Model of Data for Large Shared Data Banks by E. F. Codd
= A Relational Model of Data for Large Shared Data Banks by E. F. Codd
{c}
{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.