References
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- Codd , E.F. The Relational Model for Database Management Version Two . Reading MA Addison-Wesley , 1990 .
- Date , C.J. An Introduction of Database Systems . 4th ed . Reading MA Addison-Wesley , 1986 .
- “What is a Distributed Database System?” InfoDB (Summer and Fall 1987) .
- Doak , J.A. “ IBM Distributed Relational Data .” InfoDB ( Spring 1989 ).
- Ullman , J.D. Principles of Database and Knowledge-Base Systems . Vol 1 . Rockville MD Computer Science Press , 1988 .