Guest editorial: special issue on adbis 1999
Object query optimization through detecting independent subqueries
Efficient representation and algebraic manipulation of infinite relations in paraconsistent databases
Global extensional assertions and local integrity constraints in federated schemata
A uniform methodology for extracting type conflicts and subscheme similarities from heterogeneous databases
An efficient spatial access method for spatial images containing multiple non-overlapping features
A system for supporting organisations in knowledge-based document preparation