Michael Benedikt, Christof Löding, Jan Van den Bussche, Thomas Wilke. A Characterization of First-Order Topological Properties of Planar Spatial Data. 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 107-114, ACM, 2004. [doi]
Abstract is missing.