1. S. Abiteboul M.Y. Vardi, “Formal Systems for Untyped Dependencies,” to appear.
2. The Theory of Joins in Relational Databases;Aho;ACM Trans. Database Systems,1979
3. Dependency structures of database relationships;Armstrong,1974
4. Computational problems related to the design of normal form relational schemas;Beeri;ACM Trans. Database Systems,1979
5. A complete axiomatization for functional and multivalued dependencies in database relations;Beeri,1977