- document
- Meijers, E.M. (author), Groot, S. (author) report 2007
- document
- Michielsen, B.F. (author) report 1998
- document
- Bokhorst, M. (author), Boon, J.G. (author) report 1995
- document
- Ridder, A.C. de (author) report 1990
- document
- Rooij, N.M. de (author) report 1982