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Heuer, Andreas (1989) A Data Model for Complex Objects Based on a Semantic Database Model and Nested Relations. In: Nested Relations and Complex Objects in Databases.
Heuer, Andreas (1989) Equivalent schemes in semantic, nested relational and relational database models. In: Proceedings of the 2nd Symposium on Mathematical Fundamentals of Database Systems.
Heuer, Andreas (1989) Grundlagen von Daten- und Objektbanken: ein Überblick über Forschungs- und Entwicklungsaktivitäten an der TU Clausthal. Technical Report. TU Braunschweig, Braunschweig.
Heuer, Andreas (1989) Working group report: Operations for Complex Object / Object-Oriented Database Systems. Technical Report. TU Clausthal, Clausthal.
Heuer, Andreas and Sander, Peter (1989) Semantics and Evaluation of Rules over Complex Objects. In: Proceedings of the First International Conference on Deductive and Object-Oriented Database Systems.