Artículo: Ronald Fagin, Phokion G. Kolaitis, Renee J. Miller, Lucian Popa. Data exchange: semantics and query answering. Theoretical Computer Science 336(1): 89-124 (2005)..pdf

19 Jul 200719/07/07 at 13:502007-07-19 13:50:19 por Pablo Barcelo B.