Ronald Fagin, Phokion G. Kolaitis, Lucian Popa, Wang Chiew Tan. Composing Schema Mappings: Second-Order Dependencies to the Rescue. In Alin Deutsch, editor, Proceedings of the Twenty-third ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, June 14-16, 2004, Paris, France. pages 83-94, ACM, 2004. [doi]
Abstract is missing.