Alfred V. Aho, Yehoshua Sagiv, Jeffrey D. Ullman. Efficient Optimization of a Class of Relational Expressions (Abstract). In Eugene I. Lowenthal, Nell B. Dale, editors, Proceedings of the 1978 ACM SIGMOD International Conference on Management of Data, Austin, Texas, May 31 - June 2, 1978. pages 39, ACM, 1978. [doi]
Abstract is missing.