Surajit Chaudhuri, Moshe Y. Vardi. Optimization of ::::Real:::: Conjunctive Queries. In Proceedings of the Twelfth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, May 25-28, 1993, Washington, DC. pages 59-70, ACM Press, 1993. [doi]
Abstract is missing.