Manolis Koubarakis, Spiros Skiadopoulos. Tractable Query Answering in Indefinite Constraint Databases: Basic Results and Applications to Querying Spatiotemporal Information. In Michael H. Böhlen, Christian S. Jensen, Michel Scholl, editors, Spatio-Temporal Database Management, International Workshop STDBM 99, Edinburgh, Scotland, September 10-11, 1999, Proceedings. Volume 1678 of Lecture Notes in Computer Science, pages 204-223, Springer, 1999. [doi]
Abstract is missing.