Integrated Fact and Rule Management Based on Relational Technology. - Joachim W. Schmidt; Lingyuan Ge; Volker Linnemann; Matthias Jarke (Foundations of Knowledge Base Management (Xania), 1985)

Database Applications Support in Open Systems: Language Concepts and Implementation Architectures. - Lingyuan Ge; Wolfgang Johannsen; Winfried Lamersdorf; Kurt Reinhardt; Joachim W. Schmidt (ICDE, 1988)