Die Spezifikation informationsverarbeitender Systeme mit Abstrakten Objekttypen. - Peter Baumann 005 (BTW, 1991)

Evaluation of Complex Cardinality Constraints. - Jian Zhou; Peter Baumann 005 (ER, 1992)

Language Support for Raster Image Manipulation in Databases. - Peter Baumann 005 (Graphics Modeling and Visualization in Science and Technology, 1992)