1. Stephen Blott, Helmut Kaufmann, Lukas Relly, and Hans-Jorg Schek. Buffering Long Externally-Defined Objects. In M.P. Atkinson, V. Benzaken, and D. Maier, editors, Proceedings of the Sixth International Workshop on Persistent Object Systems (POS6), pages 40–53, Tarascon, France, September 1994. British Computer Society, Springer-Verlag.
2. Stephen Blott, Lukas Relly, and Hans-Jörg Schek. An open abstract-object storage system. In Proceedings of the 1996 ACM SIGMOD Conference on Management of Data, June 1996.
3. D. Comer. The ubiquitous B-tree. ACM Computing Surveys, 11(2):121–137, 1979.
4. Gisbert Dröge. Eine anfrage-adaptive Partitionierungsstrategie fur Raumzugriffsmethoden in Geo-Datenbanken. PhD thesis, Eidgenössisch Technische Hochschule (ETH), Zürich, CH-8092 Zürich, Switzerland, 1995.
5. O. Henricsson. Analysis of Image Structures using Color Attributes and Similarity Relations. PhD thesis, Swiss Federal Institute of Technology (ETH) Zurich, 1996. No. 11663, also published in Mitteilungen Nr. 59 at the Institute of Geodesy and Photogrammetry.