A Practical Approach to Access Heterogeneous and Distributed Databases. - Fernando de Ferreira Rezende; Ulrich Hermsen; Georgiane de Sá Oliveira; Renata Costa Guedes Pereira; Jochen Rütschlin (CAiSE, 1999)

A Unified Database Interface for Multiple Heterogeneous Databases. - Fernando de Ferreira Rezende; Georgiane de Sá Oliveira; Renata Costa Guedes Pereira; Ulrich Hermsen; Jörg Keller 002 (EFIS, 1999)