Edgar F. Codd: A Relational Model of Data for Large Shared Data Banks. In: Communications of the ACM. ACM Press, 13. Juni 1970, ISSN0001-0782, S.377–387 (englisch, acm.org).
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Edgar F. Codd: A Relational Model of Data for Large Shared Data Banks. In: Communications of the ACM. ACM Press, 13. Juni 1970, ISSN0001-0782, S.377–387 (englisch, acm.org).