Michael Benedikt, Martin Grohe, Leonid Libkin, Luc Segoufin. Reachability and Connectivity Queries in Constraint Databases. In Proceedings of the Nineteenth ACM SIGMOD-SIGACT-SIGART Symposium on Principles of Database Systems, May 15-17, 2000, Dallas, Texas, USA. pages 104-115, ACM, 2000. [doi]
Abstract is missing.