Balder ten Cate, Phokion G. Kolaitis. Structural characterizations of schema-mapping languages. In Ronald Fagin, editor, Database Theory - ICDT 2009, 12th International Conference, St. Petersburg, Russia, March 23-25, 2009, Proceedings. Volume 361 of ACM International Conference Proceeding Series, pages 63-72, ACM, 2009. [doi]
Abstract is missing.