A relational model of data for large shared data banks
Communications of the ACM
Report to X3 on data definition languages
ACM SIGMOD Record
A taxonomy of data definition languages
ACM SIGMOD Record
Software compatibility: what was promised, what we have, what we need
AFIPS '68 (Fall, part I) Proceedings of the December 9-11, 1968, fall joint computer conference, part I
Description of a set-theoretic data structure
AFIPS '68 (Fall, part I) Proceedings of the December 9-11, 1968, fall joint computer conference, part I
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