Conference paper
A data base sublanguage founded on the relational calculus
E.F. Codd
SIGFIDET 1971
Paper
Data models in database management
Related
Conference paper
Normalized data base structure: A brief tutorial
E.F. Codd
SIGFIDET 1971
Conference paper
Data base management
E.F. Codd
National Computer Conference AFIPS 1975
E.F. Codd
ACM SIGPLAN Notices