- document
- Waal, J.P. de (author) report 1993
- document
- Vroeg, J.H. de (author) report 1992
- document
- Derks, H. (author), Klein Breteler, M. (author) report 1992
- document
- Klein Breteler, M. (author) report 1990
- document
- report 1988
- document
- Boer, K. den (author) report 1982
- document
- Bezuijen, A. (author) report 1982