1. The theory of joins in relational databases;Aho;TODS,1979
2. Dependency structures of database relationships;Armstrong,1974
3. The information preserving properties of certain relational database transformations;Arora,1978
4. A sophisticate's introduction to database normalization theory;Beeri,1978
5. A complete axiomatization for functional and multivalued dependencies;Beeri,1977