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E. F. Codd A Relational Model of Data for Large Shared Data Banks. [Citation Graph (580, 0)][DBLP] Commun. ACM, 1970, v:13, n:6, pp:377-387 [Journal]
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E. F. Codd A Database Sublanguage Founded on the Relational Calculus. [Citation Graph (61, 0)][DBLP] SIGFIDET Workshop, 1971, pp:35-68 [Conf]