Stephan Kreutzer. Query Languages for Constraint Databases: First-Order Logic, Fixed-Points, and Convex Hulls. In Jan Van den Bussche, Victor Vianu, editors, Database Theory - ICDT 2001, 8th International Conference, London, UK, January 4-6, 2001, Proceedings. Volume 1973 of Lecture Notes in Computer Science, pages 248-262, Springer, 2001. [doi]
Abstract is missing.