Conference paper
A data base sublanguage founded on the relational calculus
E.F. Codd
SIGFIDET 1971
No abstract available.
E.F. Codd
SIGFIDET 1971
E.F. Codd, C.J. Date
SIGFIDET 1974
E.F. Codd
SIGMOD Record
E.F. Codd
National Computer Conference AFIPS 1975