[ACM] Proceedings on the ACM SIGFIDET Workshop on Data Description, Access, and Control, San Diego, California (November 1971) (1971) |
- Codd, E.F. (1971) Codd, E.F. "A database sublanguage founded on the relational calculus" pp35-68
- Engels, R.W., (1971) Engels, R.W., "An analysis of the April 1971 DBTG report" pp69-91
- Engles, R. W. (1971) Engles, R. W. "An Analysis of the April, 1971, Data Base Task Group Report" pp69-91
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