D. Davison, and G. Graefe. SIGMOD '95: Proceedings of the 1995 ACM SIGMOD international conference
on Management of data, page 281--292. New York, NY, USA, ACM, (1995)
S. Freyer, J. Graefe, M. Heinzel, and P. Marenbach. Eufit '98, 6th European Congress on Intelligent
Techniques and Soft Computing, ELITE - European
Laboratory for Intelligent TechniquesEngineering, III, page 1471--1475. Aachen, Germany, (1998)
G. Graefe, C. Maa�, and A. He�. volume P-113 of GI-Edition - Lecture Notes in Informatics (LNI), ISSN 1617-5468, Bonner Köllen Verlag, (September 2007)