- document
- Bokhorst, M. (author), Los, F.J. (author) report 1997
- document
- Bokhorst, M. (author), Boon, J.G. (author) report 1995
- document
- Michielsen, B.F. (author), Bokhorst, M. (author), Los, F.J. (author) report 1995
- document
- Boon, J.G. (author), Bokhorst, M. (author) report 1994