Bertram Ludäscher, Alan Nash. Web Service Composition Through Declarative Queries: The Case of Conjunctive Queries with Union and Negation. In Proceedings of the 20th International Conference on Data Engineering, ICDE 2004, 30 March - 2 April 2004, Boston, MA, USA. pages 840, IEEE Computer Society, 2004. [doi]
Abstract is missing.