1. The Proteus Distributed Database System;Atkinson,1984
2. ADDS: Heterogeneous Distributed Database System;Breitbart,1985
3. DATAFLEX: An Access to Heterogeneous Distributed Databases;Chung;CACM,1990
4. Implementation of a Prototype for Preci∗;Deen;The Computer Journal,1987
5. ISO/CD 9579, “Information Processing Systems - Open System Interconnection - Remote Database Access”.