On Interoperability for KBMS Applications - The Horizontal Integration Task. - Benn, Wolfgang; Kortenbreer, Christian; Schlageter, Gunter; Wu, Xinglin (1992)

Berichte von der BTW'91. - Kortenbreer, Christian; Goebel, Vera (Datenbank Rundbr., 1991)

Towards Interoperability: Vertical Integration of Languages with a KBMS. - Benn, Wolfgang; Kortenbreer, Christian; Wu, Xinglin (1991)