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* [[Alfred Aho | A. V. Aho]], C. Beeri, and [[Jeffrey Ullman | J. D. Ullman]]: ''The Theory of Joins in Relational Databases''. ACM Transactions on Database Systems 4(3): 297-314, 1979.
* [[Jeffrey Ullman | J. D. Ullman]]: ''Principles of Database and Knowledge-Base Systems, Volume I''. Computer Science Press, New York, 1988.
* [[Jeffrey Ullman | J. D. Ullman]]
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