J. Hartog. University of Technology -- TU, Delft, The Netherlands, Master Thesis, (March 2007)http://www.st.ewi.tudelft.nl/sat/theses/jantien.pdf
-- last visited $9^th$ september 2007.
T. van Engers, P. Kordelaar, J. Hartog, and E. Glassée. Proceedings of the 11th workshop on Databases and Expert SystemsApplications
(IEEE), page 327-334. Greenwich London, (2000)ISBN: 0-7695-0680-1.
T. van Engers, P. Kordelaar, J. Hartog, and E. Glassée. In Proceedings of the 11th workshop on Databases and Expert Systems
Applications (IEEE), page 327-334. Greenwich London, (2000)ISBN: 0-7695-0680-1.